Gastritis differential diagnosis: Difference between revisions

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__NOTOC__
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{{Gastritis}}
[[Image:Home_logo1.png|right|250px|link=https://www.wikidoc.org/index.php/Gastritis]]
{{CMG}}
{{CMG}} {{AE}} {{ARK}}


==Overview==
==Overview==
Gastritis must be differentiated from peptic ulcer disease, gastric cancer, gastroesophageal reflux disease, gastroenteritis, and Crohn's disease.
Gastritis must be differentiated from [[peptic ulcer disease]], [[Stomach cancer|gastric cancer]], [[gastroesophageal reflux disease]] ([[Gastroesophageal reflux disease|GERD]]), [[gastroenteritis]], [[crohn's disease]], [[gastrinoma]], [[gastric adenocarcinoma]] and primary gastric lymphoma.


==Differentiating Gastritis from other Diseases==
==Differentiating Gastritis from other Diseases==
Differentiating gastritis from other Diseases:
*'''Acute Gastritis'''
**[[Crohn's Disease]]
**[[Gallstones]] ([[Cholelithiasis]])
**[[Cholecystitis]]
**[[Gastric cancer]]
**[[Peptic Ulcer Disease]]
**[[Viral Gastroenteritis]]
**Acute Complications of [[Sarcoidosis]]
**[[B-Cell Lymphoma]]
*'''Chronic Gastritis'''
**[[Atrophic Gastritis]]
**[[Gastroesophageal Reflux Disease]] ([[GERD]])
**[[Crohn's Disease]]
*'''Atrophic Gastritis'''
**[[Chronic Gastritis]]
**Functional (Nonulcer) [[Dyspepsia]]
**[[Gastroesophageal Reflux Disease]] ([[GERD]])
**[[Pernicious Anemia]]
*'''Stress related/induced Gastritis'''
**[[Alcoholic gastropathy]]
**Nonsteroidal anti-inflammatory drug, ([[NSAID]]) induced gastritis
**[[Peptic Ulcer Disease]]
**[[Uremic gastropathy]]
*'''Helicobacter Pylori-associated Gastritis'''
**[[Autoimmune gastritis]]
**[[Nonspecific chronic inactive gastritis]]
**[[Gastritis]] in patients with [[Crohn's disease]] involving the stomach
**[[Gastropathy]] in the setting of chronic conditions (eg, portal hypertensive gastropathy)
**[[Lymphocytic gastritis]]
*'''Other differentials'''
**[[Ménétrier disease]] (Rare disorder)
**[[Aortic aneurysm]] (ruptured)
**[[Candida]]
**[[Crohn's Disease]]
**[[Cytomegalovirus]] (CMV) in [[HIV]]
**Diseases of the biliary system
**[[Drugs]]
**[[Esophageal varices]]
**Functional dyspepsia
**[[Gastric carcinoma]]
**[[Gastroduodenal ulcer]]
**Intoxication
**[[Liver failure]]
**Lymphocytic gastritis
**[[Mallory-Weiss Tear]]
**[[Menetrier's Disease]]
**[[Pancreas carcinoma]]
**[[Pancreatitis]]
**[[Peptic ulcer]]
**[[Perforated ulcer]]
**[[Radiation]]
**Reflux esophagitis
**[[Renal Failure]]
**Respiratory failure
**[[Sarcoidosis]]
**[[Sepsis]]
**[[Shock]]
**[[Surgery]]
**[[Syphilis]]
**[[Trauma]]
**[[Tuberculosis]]
**[[Volvulus]]
**[[Zollinger-Ellison Syndrome]]
<br />
<br />
* '''The table below differentiates gastritis from other conditions:'''<ref name="pmid6710074">{{cite journal| author=Sugimachi K, Inokuchi K, Kuwano H, Ooiwa T| title=Acute gastritis clinically classified in accordance with data from both upper GI series and endoscopy. | journal=Scand J Gastroenterol | year= 1984 | volume= 19 | issue= 1 | pages= 31-7 | pmid=6710074 | doi= | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=6710074  }} </ref><ref name="pmid25901896">{{cite journal| author=Sipponen P, Maaroos HI| title=Chronic gastritis. | journal=Scand J Gastroenterol | year= 2015 | volume= 50 | issue= 6 | pages= 657-67 | pmid=25901896 | doi=10.3109/00365521.2015.1019918 | pmc=4673514 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=25901896  }} </ref><ref name="pmid16819502">{{cite journal| author=Sartor RB| title=Mechanisms of disease: pathogenesis of Crohn's disease and ulcerative colitis. | journal=Nat Clin Pract Gastroenterol Hepatol | year= 2006 | volume= 3 | issue= 7 | pages= 390-407 | pmid=16819502 | doi=10.1038/ncpgasthep0528 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=16819502  }} </ref><ref name="pmid2789799">{{cite journal| author=Sipponen P| title=Atrophic gastritis as a premalignant condition. | journal=Ann Med | year= 1989 | volume= 21 | issue= 4 | pages= 287-90 | pmid=2789799 | doi= | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=2789799  }} </ref><ref name="pmid25133039">{{cite journal| author=Badillo R, Francis D| title=Diagnosis and treatment of gastroesophageal reflux disease. | journal=World J Gastrointest Pharmacol Ther | year= 2014 | volume= 5 | issue= 3 | pages= 105-12 | pmid=25133039 | doi=10.4292/wjgpt.v5.i3.105 | pmc=4133436 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=25133039  }} </ref><ref name="pmid17956071">{{cite journal| author=Ramakrishnan K, Salinas RC| title=Peptic ulcer disease. | journal=Am Fam Physician | year= 2007 | volume= 76 | issue= 7 | pages= 1005-12 | pmid=17956071 | doi= | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=17956071  }} </ref><ref name="pmid17985090">{{cite journal| author=Banasch M, Schmitz F| title=Diagnosis and treatment of gastrinoma in the era of proton pump inhibitors. | journal=Wien Klin Wochenschr | year= 2007 | volume= 119 | issue= 19-20 | pages= 573-8 | pmid=17985090 | doi=10.1007/s00508-007-0884-2 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=17985090  }} </ref><ref name="pmid15621988">{{cite journal| author=Dicken BJ, Bigam DL, Cass C, Mackey JR, Joy AA, Hamilton SM| title=Gastric adenocarcinoma: review and considerations for future directions. | journal=Ann Surg | year= 2005 | volume= 241 | issue= 1 | pages= 27-39 | pmid=15621988 | doi= | pmc=1356843 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=15621988  }} </ref><ref name="pmid21390139">{{cite journal| author=Ghimire P, Wu GY, Zhu L| title=Primary gastrointestinal lymphoma. | journal=World J Gastroenterol | year= 2011 | volume= 17 | issue= 6 | pages= 697-707 | pmid=21390139 | doi=10.3748/wjg.v17.i6.697 | pmc=3042647 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=21390139  }} </ref>


* [[Aortic aneurysm]] (ruptured)
{| class="wikitable" style="border: 0px; font-size: 90%; margin: 3px;" align="center"
* [[Candida]]
| colspan="13" style="background: #4479BA; text-align: center;" | {{fontcolor|#FFF|'''Differential Diagnosis'''}}
* [[Crohn's Disease]]
|+
* [[Cytomegalovirus]] (CMV) in [[HIV]]
| rowspan="3" style="background:#4479BA; padding: 5px 5px;" align="center" |{{fontcolor|#FFF|'''Disease'''}}
* Diseases of the biliary system
| rowspan="3" style="background:#4479BA; padding: 5px 5px;" align="center" |{{fontcolor|#FFF|'''Cause'''}}
* [[Drugs]]
| colspan="9" style="background:#4479BA; padding: 5px 5px;" align="center" |{{fontcolor|#FFF|'''Symptoms'''}}
* [[Esophageal varices]]
| style="background:#4479BA; padding: 5px 5px;" align="center" |{{fontcolor|#FFF|'''Diagnosis'''}}
* Functional dyspepsia
| rowspan="3" style="background:#4479BA; padding: 5px 5px;" align="center" |{{fontcolor|#FFF|'''Other findings'''}}
* [[Gastric carcinoma]]
|-
* [[Gastroduodenal ulcer]]
| colspan="3" style="background:#4479BA; padding: 5px 5px;" align="center" |{{fontcolor|#FFF|'''Pain'''}}
* Intoxication
| rowspan="2" style="background:#4479BA; padding: 5px 5px;" align="center" |{{fontcolor|#FFF|'''Nausea & Vomiting'''}}
* [[Liver failure]]
| rowspan="2" style="background:#4479BA; padding: 5px 5px;" align="center" |{{fontcolor|#FFF|'''Heartburn'''}}
* Lymphocytic gastritis
| rowspan="2" style="background:#4479BA; padding: 5px 5px;" align="center" |{{fontcolor|#FFF|'''Belching or Bloating'''}}
* [[Mallory-Weiss Tear]]
| rowspan="2" style="background:#4479BA; padding: 5px 5px;" align="center" |{{fontcolor|#FFF|'''Weight loss'''}}
* [[Menetrier's Disease]]
| rowspan="2" style="background:#4479BA; padding: 5px 5px;" align="center" |{{fontcolor|#FFF|'''Loss of Appetite'''}}
* [[Pancreas carcinoma]]
| rowspan="2" style="background:#4479BA; padding: 5px 5px;" align="center" |{{fontcolor|#FFF|'''Stools'''}}
* [[Pancreatitis]]
| rowspan="2" style="background:#4479BA; padding: 5px 5px;" align="center" |{{fontcolor|#FFF|'''Endoscopy findings'''}}
* [[Peptic ulcer]]
|-
* [[Perforated ulcer]]
| rowspan="1" style="background:#4479BA; padding: 5px 5px;" align="center" |{{fontcolor|#FFF|'''Location'''}}
* [[Radiation]]
| rowspan="1" style="background:#4479BA; padding: 5px 5px;" align="center" |{{fontcolor|#FFF|'''Aggravating Factors'''}}
* Reflux esophagitis
| rowspan="1" style="background:#4479BA; padding: 5px 5px;" align="center" |{{fontcolor|#FFF|'''Alleviating Factors'''}}
* [[Renal Failure]]
|-
* Respiratory failure
| style="padding: 5px 5px; background: #DCDCDC;" |[[Acute gastritis|'''Acute gastritis''']]
* [[Sarcoidosis]]
| style="padding: 5px 5px; background: #F5F5F5;" |
* [[Sepsis]]
* ''[[H. pylori]]''
* [[Shock]]
* [[NSAIDS]]
* [[Surgery]]
* [[Corticosteroids]]
* [[Syphilis]]
* [[Alcohol]]
* [[Trauma]]
* Spicy food
* [[Tuberculosis]]
* [[Viral infections]]
* [[Volvulus]]
* [[Crohn's disease]]
* [[Zollinger-Ellison Syndrome]]
* [[Autoimmune diseases]]
* Bile reflux
* [[Cocaine]] use
* Breathing machine or ventilator
* Ingestion of [[corrosive|corrosives]]
|
* [[Epigastric pain]]
|Food
|[[Antacids]]
|✔
|✔
|✔
|<nowiki>-</nowiki>
|✔
|[[Melena|Black stools]]
|
* [[Pangastritis]] or antral [[gastritis]]
* [[Gastric erosion|Erosive]] (Superficial, deep, hemorrhagic)
* Nonerosive (''[[H. pylori]]'')
|<nowiki>-</nowiki>
|-
| style="padding: 5px 5px; background: #DCDCDC;" |[[Gastritis|'''Chronic gastritis''']]
| style="padding: 5px 5px; background: #F5F5F5;" |
* ''[[H. pylori]]''
* [[Alcohol]]
* Medications
* [[Autoimmune diseases]]
* Chronic stress
|
* [[Epigastric pain]]
|Food
|[[Antacids]]
|✔
|✔
|✔
|✔
|✔
|<nowiki>-</nowiki>
|''[[H. pylori]] [[gastritis]]''
* [[Atrophy]]
* Intestinal [[metaplasia]]
Lymphocytic gastritis
* Enlarged folds
* Aphthoid erosions
|<nowiki>-</nowiki>
|-
| style="padding: 5px 5px; background: #DCDCDC;" |[[Atrophic gastritis|'''Atrophic gastritis''']]
| style="padding: 5px 5px; background: #F5F5F5;" |
* ''[[H. pylori]]''
* [[Autoimmune disease]]
|
*[[Epigastric pain]]
|<nowiki>-</nowiki>
|<nowiki>-</nowiki>
|✔
|<nowiki>-</nowiki>
|
|✔
|✔
|<nowiki>-</nowiki>
|''[[H. pylori]]''
* Mucosal [[atrophy]]
[[Autoimmune]]
* Mucosal [[atrophy]]
|
* [[Iron deficiency anemia]]
*Autoimmune gastritis diagnosis includes:
**Antiparietal and anti-IF antibodies
**[[Achlorhydria]] and hypergastrinemia
**Low serum [[vitamin B12|cobalamine]]
|-
| style="padding: 5px 5px; background: #DCDCDC;" |[[Crohn's disease|'''Crohn's disease''']]
| style="padding: 5px 5px; background: #F5F5F5;" |
* [[Autoimmune disease]]
|
* [[Abdominal pain]]
|<nowiki>-</nowiki>
|<nowiki>-</nowiki>
|<nowiki>-</nowiki>
|<nowiki>-</nowiki>
|<nowiki>-</nowiki>
|✔
|✔
|
* Chronic [[diarrhea]] often bloody with [[pus]] or [[mucus]]
* [[Rectal bleeding]]
|
* Mucosal nodularity with cobblestoning
* Multiple [[aphthous ulcers]]
* Linier or serpiginous ulcerations
* Thickened antral folds
* Antral narrowing
* Hypoperistalsis
* Duodenal strictures
|
* [[Fever]]
* [[Fatigue]]
* [[Anemia]] ([[pernicious anemia]])
|-
| style="padding: 5px 5px; background: #DCDCDC;" |[[GERD|'''GERD''']]
| style="padding: 5px 5px; background: #F5F5F5;" |
* Lower esophageal sphincter abnormalities
* [[Hiatal hernia]]
* Abnormal esophageal contractions
* Prolonged emptying of [[stomach]]
* [[Gastrinoma|Gastrinomas]]
|
* [[Epigastric pain]]
|
* Spicy food
* Tight fitting clothing
|
* [[Antacids]]
* Head elevation during sleep
|✔
 
(Suspect delayed gastric emptying)
|✔
|<nowiki>-</nowiki>
|<nowiki>-</nowiki>
|<nowiki>-</nowiki>
|<nowiki>-</nowiki>
|
* [[Esophagitis]]
* [[Barrette's esophagus]]
* [[Strictures]]
|Other symptoms:
* [[Dysphagia]]
* [[Regurgitation]]
* [[Cough|Nocturnal cough]]
* [[Hoarseness]]
Complications
* [[Esophagitis]]
* [[Strictures]]
* Barrette esophagus
|-
| style="padding: 5px 5px; background: #DCDCDC;" |[[Peptic ulcer disease|'''Peptic ulcer disease''']]
| style="padding: 5px 5px; background: #F5F5F5;" |
* ''[[H. pylori]]''
* [[Smoking]]
* [[Alcohol]]
* [[Radiation therapy]]
* Medications
* [[Zollinger-Ellison syndrome]]
|
* [[Epigastric pain]] sometimes extending to back
* [[Right upper quadrant pain]]
|
'''[[Duodenal ulcer]]'''
*Pain aggravates with empty stomach
'''[[Gastric ulcer]]'''
*Pain aggravates with food
|
* [[Antacids]]
 
* [[Duodenal ulcer]]
:*Pain alleviates with food
|✔
|✔
|<nowiki>-</nowiki>
|<nowiki>-</nowiki>
|<nowiki>-</nowiki>
|
* [[Melena|Black stools]]
|'''Gastric ulcers'''
* Discrete mucosal lesions with a punched-out smooth ulcer base with whitish fibrinoid base
* Most [[ulcers]] are at the junction of [[fundus]] and antrum
* 0.5-2.5cm
'''Duodenal ulcers'''
* Well-demarcated break in the [[mucosa]] that may extend into the [[muscularis propria]] of the [[duodenum]]
* Found in the first part of [[duodenum]]
* <1cm
|'''Other diagnostic tests'''
* Serum [[gastrin]] levels
* [[Secretin]] stimulation test
* [[Biopsy]]
|-
| style="padding: 5px 5px; background: #DCDCDC;" |[[Gastrinoma|'''Gastrinoma''']]
| style="padding: 5px 5px; background: #F5F5F5;" |
* Associated with [[MEN type 1]]
|
* [[Abdominal pain]]
|<nowiki>-</nowiki>
|<nowiki>-</nowiki>
|✔
 
(suspect [[gastric outlet obstruction]])
|✔
|<nowiki>-</nowiki>
|<nowiki>-</nowiki>
|<nowiki>-</nowiki>
|
* [[Melena|Black stools]]
|Useful in collecting the tissue for [[biopsy]]
|
* May present with symptoms of [[GERD]] or [[peptic ulcer disease]]
* Associated with [[MEN type 1]]
'''Diagnostic tests'''
* Serum [[gastrin]] levels
* [[Somatostatin]] receptor [[scintigraphy]]
* [[CT]] and [[MRI]]
|-
| style="padding: 5px 5px; background: #DCDCDC;" |[[Gastric Cancer|'''Gastric Adenocarcinoma''']]
| style="padding: 5px 5px; background: #F5F5F5;" |
* ''[[H. pylori]]'' infection
* Smoked and salted food
|
* [[Abdominal pain]]
|<nowiki>-</nowiki>
|<nowiki>-</nowiki>
|✔
|✔
|✔
|✔
|✔
|
* [[Melena|Black stools]], or blood in stools
|'''Esophagogastroduodenoscopy'''
* Multiple biopsies are taken to establish the diagnosis
|'''Other symptoms'''
* [[Dysphagia]]
* Early [[satiety]]
* Frequent [[burping]]
|-
| style="padding: 5px 5px; background: #DCDCDC;" |[[Gastric lymphoma|'''Primary gastric lymphoma''']]
| style="padding: 5px 5px; background: #F5F5F5;" |
* ''[[H. pylori]]'' infection
|
* [[Abdominal pain]]
* [[Chest pain]]
|<nowiki>-</nowiki>
|<nowiki>-</nowiki>
|<nowiki>-</nowiki>
|<nowiki>-</nowiki>
|<nowiki>-</nowiki>
|✔
|<nowiki>-</nowiki>
|<nowiki>-</nowiki>
|Useful in collecting the tissue for [[biopsy]]
|'''Other symptoms'''
* Painless swollen [[lymph nodes]] in neck and armpit
* Night sweats
* [[Fatigue]]
* [[Fever]]
* [[Cough]] or trouble breathing
|}


==References==
==References==
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{{WS}}
{{WS}}


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[[Category:Medicine]]
[[Category:Gastroenterology]]
[[Category:Gastroenterology]]
[[Category:Up-To-Date]]
[[Category:Differential diagnosis]]

Latest revision as of 21:49, 29 July 2020

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief: Aravind Reddy Kothagadi M.B.B.S[2]

Overview

Gastritis must be differentiated from peptic ulcer disease, gastric cancer, gastroesophageal reflux disease (GERD), gastroenteritis, crohn's disease, gastrinoma, gastric adenocarcinoma and primary gastric lymphoma.

Differentiating Gastritis from other Diseases

Differentiating gastritis from other Diseases:



Differential Diagnosis
Disease Cause Symptoms Diagnosis Other findings
Pain Nausea & Vomiting Heartburn Belching or Bloating Weight loss Loss of Appetite Stools Endoscopy findings
Location Aggravating Factors Alleviating Factors
Acute gastritis Food Antacids - Black stools -
Chronic gastritis Food Antacids - H. pylori gastritis

Lymphocytic gastritis

  • Enlarged folds
  • Aphthoid erosions
-
Atrophic gastritis - - - - H. pylori

Autoimmune

Crohn's disease - - - - -
  • Mucosal nodularity with cobblestoning
  • Multiple aphthous ulcers
  • Linier or serpiginous ulcerations
  • Thickened antral folds
  • Antral narrowing
  • Hypoperistalsis
  • Duodenal strictures
GERD
  • Spicy food
  • Tight fitting clothing

(Suspect delayed gastric emptying)

- - - - Other symptoms:

Complications

Peptic ulcer disease

Duodenal ulcer

  • Pain aggravates with empty stomach

Gastric ulcer

  • Pain aggravates with food
  • Pain alleviates with food
- - - Gastric ulcers
  • Discrete mucosal lesions with a punched-out smooth ulcer base with whitish fibrinoid base
  • Most ulcers are at the junction of fundus and antrum
  • 0.5-2.5cm

Duodenal ulcers

Other diagnostic tests
Gastrinoma - -

(suspect gastric outlet obstruction)

- - - Useful in collecting the tissue for biopsy

Diagnostic tests

Gastric Adenocarcinoma - - Esophagogastroduodenoscopy
  • Multiple biopsies are taken to establish the diagnosis
Other symptoms
Primary gastric lymphoma - - - - - - - Useful in collecting the tissue for biopsy Other symptoms

References

  1. Sugimachi K, Inokuchi K, Kuwano H, Ooiwa T (1984). "Acute gastritis clinically classified in accordance with data from both upper GI series and endoscopy". Scand J Gastroenterol. 19 (1): 31–7. PMID 6710074.
  2. Sipponen P, Maaroos HI (2015). "Chronic gastritis". Scand J Gastroenterol. 50 (6): 657–67. doi:10.3109/00365521.2015.1019918. PMC 4673514. PMID 25901896.
  3. Sartor RB (2006). "Mechanisms of disease: pathogenesis of Crohn's disease and ulcerative colitis". Nat Clin Pract Gastroenterol Hepatol. 3 (7): 390–407. doi:10.1038/ncpgasthep0528. PMID 16819502.
  4. Sipponen P (1989). "Atrophic gastritis as a premalignant condition". Ann Med. 21 (4): 287–90. PMID 2789799.
  5. Badillo R, Francis D (2014). "Diagnosis and treatment of gastroesophageal reflux disease". World J Gastrointest Pharmacol Ther. 5 (3): 105–12. doi:10.4292/wjgpt.v5.i3.105. PMC 4133436. PMID 25133039.
  6. Ramakrishnan K, Salinas RC (2007). "Peptic ulcer disease". Am Fam Physician. 76 (7): 1005–12. PMID 17956071.
  7. Banasch M, Schmitz F (2007). "Diagnosis and treatment of gastrinoma in the era of proton pump inhibitors". Wien Klin Wochenschr. 119 (19–20): 573–8. doi:10.1007/s00508-007-0884-2. PMID 17985090.
  8. Dicken BJ, Bigam DL, Cass C, Mackey JR, Joy AA, Hamilton SM (2005). "Gastric adenocarcinoma: review and considerations for future directions". Ann Surg. 241 (1): 27–39. PMC 1356843. PMID 15621988.
  9. Ghimire P, Wu GY, Zhu L (2011). "Primary gastrointestinal lymphoma". World J Gastroenterol. 17 (6): 697–707. doi:10.3748/wjg.v17.i6.697. PMC 3042647. PMID 21390139.

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