"Pills" relative safety gains further support.
D001695:Biology; D001769:Blood; D001777:Blood Coagulation; D003267:Contraception; D003276:Contraceptives, Oral; D003710:Demography; D005123:Eye; D005193:Family Planning Services; D010827:Physiology; D011153:Population; D011157:Population Dynamics; D013995:Time; D013997:Time Factors
D003276:Contraceptives, Oral
Biology; Blood Coagulation Effects; Contraception; Contraceptive Methods--side effects; Demographic Factors; Family Planning; Hematological Effects; Hemic System; Longterm Effects; Ophthalmological Effects; Oral Contraceptives--side effects; Physiology; Population; Population Dynamics; Time Factors