MugieSM,BenningaMA, 2011.Epidemiology of constipation in children and adults: a systematic review,Best Pract Res Clin Gastroenterol 25 3 -18
JohansonJ,KralsteinJ, 2007.Chronic constipation: a survey of the patient perspective,Aliment Pharmacol Ther 25 599 -608
Virginia 2006.The Functional Gastrointestinal Disorders. Drossman DA, editor,McLean -
WongRK,PalssonOS,TurnerMJ,LevyR,FeldAD,von KorffM, 2010.Inability of the Rome III criteria to distinguish functional constipation from constipation subtype irritable bowel syndrome,Am J Gastroenterol 105 2228 -34
KhatriPK,AliAD,AlzadjaliN,BhagiaG,KhaliqdinaSJ,AzizS., 2011.Frequency of functional constipation in 3 different populations and its causative factors,J Pak Med Assoc 61 1149 -52
JainA,GuptaO,JajooU,SidhwaH., 1991.Clinical profile of irritable bowel syndrome at a rural-based teaching hospital in central India,J Assoc Physicians India 39 385 -6