1. Department of Hygiene, Medical Faculty, Charles University, Šimkova 870, 500 38 Hradec Králové
2. Department of Occupational Hygiene, Regional Hygiene Station, Balbínova 821, 500 31 Hradec Králové
3. Computer Centre, Medical Faculty, Charles University, Simkova 870, 500 38 Hradec Králové, Czechoslovakia