Ayub A, Linjawi T, Qadri S M, Ingemannson S, Zafar M, al-Harbi A
Department of Medicine, King Faisal Specialist Hospital and Research Centre, Riyadh, Kingdom of Saudi Arabia.
J Clin Gastroenterol. 1994 Apr;18(3):238-9. doi: 10.1097/00004836-199404000-00014.