"Sunday-start" OC regimen popular but may pose risk.
D000569:Americas; D003267:Contraception; D003276:Contraceptives, Oral; D003710:Demography; D019049:Developed Countries; D004467:Economics; D005193:Family Planning Services; D008389:Marketing of Health Services; D008597:Menstrual Cycle; D008598:Menstruation; D009656:North America; D011153:Population; D011157:Population Dynamics; D019064:Product Packaging; D012098:Reproduction; D013997:Time Factors; D014481:United States
D003276:Contraceptives, Oral
Americas; Contraception; Contraceptive Methods; Demographic Factors; Developed Countries; Economic Factors; Family Planning; Marketing; Menstrual Cycle; Menstruation; North America; Northern America; Oral Contraceptives; Packaging; Population; Population Dynamics; Reproduction; Time Factors; United States