Headache as the reason for office visits [[electronic resource] ] : National ambulatory Medical Care Survey : United States, 1977-78 / / by Beulah K. Cypress
Pubbl/distr/stampa
[Hyattsville, Md.] : , : [U.S. Dept. of Health and Human Services, Public Health Service, Office of Health Research, Statistics, and Technology], , [1981]