Mujtaba, F A1976-10-012009-06-011976-10-012009-06-011976-10-01Mujtaba FA. Blood groups and peptic ulcer. Indian Journal of Physiology and Pharmacology. 1976 Oct-Dec; 20(4): 248-9http://imsear.searo.who.int/handle/123456789/108672engABO Blood-Group SystemHumansIndiaPeptic Ulcer --bloodLetter