PRACE DOKTORSKIE - FINLANDIA 548,158 RÄIHÄ ISMO Gastroesophageal reflux in the aged : A clinical study of age-related characteristic of gastroesophageal reflux disease / Ismo Raiha ; University of Turku. - Turku : [Turun Yliopisto], 1990. - [8], 135 s. : wykr. ; 25 cm (Annales Universitatis Turkuensis Medica-Odontologica ; ISSN 0355-9483 ; 56) summ. ISBN 951-880-442-7