Office visits to obstetricians and gynecologists : United States, 1989-90 / by Susan M. Schappert.
Published
[Hyattsville, Md.] (6525 Belcrest Rd., Hyattsville 20782) : [U.S. Dept. of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Center for Health Statistics, 1993]