ABSTRACTS 191.773 Abstracts of papers.Presented at the Hedrologicum Conlegium Fifth International Congress on Diseases of Colon and Rectum Goteborg,Sweden May 22-25 1972.Edited by J.Kewenter,N.G.Kock and B. Samenius. Oslo 1972 Universitetsforlaget 4° s.nlb.62. Scandinavaian Journal of Gastroenterology. Vol.71 Suppl.17. /Brak k.tytulowej/