THE PREVALANCE OF HELICOBACTER PYLORI IN DIFFERENT UPPER GASTROINTESTINAL SYSTEM DISEASES - GÖRAL, Vedat; TURHANOĞLU, Mine; DEĞERTEKİN, Halil; ARIKAN, Eralp; KADAYIFÇIOĞLU, Nursen; AKSOY, Nevzat; CANORUÇ, Fikri (Turkish Journal of Gastroenterology, 1993)