Obstetrics: Preconception and Prenatal Care
Croen, Lisa A.; Shaw, Gary M.; Sanbonmatsu, Lisa; Selvin, Steve; Buffler, Patricia A.
March of Dimes Birth Defects Foundation, California Birth Defects Monitoring Program, Emeryville, and Departments of Biostatistics and Epidemiology, School of Public Health, University of California at Berkeley, Berkeley, California.
Epidemiology 1997;8:347-354.
