Is peptic ulcer surgery on the decline? - KARAHAN, Ömer; VATANSEV, Celalettin; BELVİRANLI, Metin; AKIN, Mustafa; AĞAOĞLU, Mehmet; ÖZTÜRK, Halil; GÖNEN, Sait; ER, Cemil; AK, Mehmet (Turkish Journal of Gastroenterology, 1995)