550,499 AGREUS LARS The abdominal sympton study i an epidemiological survey of gastrointestinal and other abdominal symptoms In the adult population of Osthamaar, Sweden : [doctoral thesis) / by Agr6us Lars. - Uppsala : Acta Universitatis Upsaliensis, 1993. - 91 s. ; il., wykr. 24 cm (Comprehensive Sunmaries of Uppsala Dissertations from the Faculty of Medicine, ISSN 0208-7476 , 434) ISBN 91-554-3176-3