1988 TOKYO CONFERENCE; ACVA SEMINAR; BANGKOK CONFERENCE; BRIGHTON TOXICOLOGY CONFERENCE; BRUSSELS CONFERENCE; GRADUATE INST OF PUBLIC HEALTH; GRADUATE SCHOOL OF PHARMACEUTICAL SCIENC; HANYANG UNIV; HONG KONG UNIV; INST OF STATISTICS TAIPEI; INTL COMMISSION ON OCCUPATIONAL HEALTH; KAOHSIUNG MEDICAL COLLEGE; LISBON CONFERENCE; MANILA PEDIATRICS CONFERENCE; NATL TAIWAN UNIV COLLEGE OF MEDICINE; OXFORD; TOXICOLOGY RESEARCH CENTER KRICT; UNIV OF PHILIPPINES; UNIV OF TOKYO; UNIV OF TX; VETERANS HOSPITAL DEPT OF PATHOLOGY; WEINBERG GROUP