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