Marketing to women nurtures HMO growth.
D004219:District of Columbia; D005260:Female; D006279:Health Maintenance Organizations / Q000458:organization & administration*; D006296:Health Services / Q000600:supply & distribution*; D006801:Humans; D008389:Marketing of Health Services / Q000639:trends*; D008396:Maryland; D014768:Virginia; D014932:Women's Health Services / Q000600:supply & distribution*