1983 年 23 巻 1 号 p. 61-67
The problems on performing the monitoring and surveillance of con-genital malformations, are as follows; 1. Establishment of standard of surveillance. 2. Selection of objects for monitoring. 3. Selection of markers. 4. Set up the time of making diagnosis and diagnostic standard. 5. Establishment of system how to collect reports and to analyse these data.