“…The other indicators included in this study, i.e. ulcer of the stomach and duodenum (S, 9,26,27), congenital heart disease (8,9,29), pneumonia (S,9,2629), chronic bronchitis and emphysema (8,9,(26)(27)(28)(29), malignant neoplasms of colon and rectum (29), were suggested by Rutstein et a1 and have, with some modifications, been implemented also in studies from other countries.…”