Relation of aplastic anaemia to use of chloramphenicol eye drops in two international case-control studies

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Abstract
The data from the international granulocytosis and aplastic anaemia study were collected over varying times from 1980 to 1986 in Israel and in Ulm and Berlin (Germany), Milan (Italy), Budapest (Hungary), Sofia (Bulgaria), and Stockholm and Uppsala (Sweden); the total base population was about 19 million.2 Data collection continued independently in Sweden until 1992. The Thai study was conducted from 1989 to 1994 in Bangkok and from 1990 to 1994 in Khonkaen and Songkla; the total population was about 21 million.3