This book addresses methodological aspects of epidemiological studies on maternal drug use in pregnancy. Discussing the existing sources of error and how they can produce incorrect conclusions, it examines various epidemiological...

Authored by Bengt Källén, professor emeritus in embryology at Lund University in Sweden. ¿¿The subject of this book is to describe the occurrence of congenital malformations among children born and what risk factors exist. Population...