1. The magnitude of the problem of congenital malformations;Brent,1985
2. Very early pregnancy;Kline,1985
3. Mechanism of known environmental teratogens: Drugs and chemicals;Beckman;Clin Perinatol.,1986
4. Methodological issues for the assessment of clusters of adverse pregnancy outcomes in the workplace: The case of video display terminal users;Abenhaim;J Occup Med,1991
5. Spontaneous and induced abortion;World Health Organization (WHO),1970