SPONTANEOUS PORTOSYSTEMIC SHUNTS: RELATIONSHIP TO UPPER GASTROINTESTINAL BLEEDING AND HEPATIC ENCEPHALOPATHY - ÖKTEN, Atilla; KAYMAKOĞLU, Sabahattin; YALÇIN, Süleyman; YEĞİNSU, Oktay and BEŞIŞIK, Fatih and ACAR, Arif and BOZTAŞ, Güngör and ÇAKALOĞLU, Yılmaz and MUNGAN, Zeynel and ÖZDİL, Sadakat (Turkish Journal of Gastroenterology, 1992)