1. Bright seashells on the sand;Pearse;Am J Obstet Gynecol,1993
2. Office visits to obstetricians and gynecologists: United States, 1989–1990;Schappert;Advance Data,1993
3. Office visits to internists 1989;Woodwell;Advance Data,1992
4. The periodic physical examination in asymptomatic adults;Oboler;Ann Intern Med,1989
5. Chronic cough;Irwin;Am Rev Respir Dis,1990