Concern for a graying nation.
D001208:Asia; D001723:Birth Rate; D003267:Contraception; D003276:Contraceptives, Oral; D003625:Data Collection; D003710:Demography; D019049:Developed Countries; D005069:Evaluation Studies as Topic; D005193:Family Planning Services; D005202:Asia, Eastern; D005298:Fertility; D007722:Health Knowledge, Attitudes, Practice; D006297:Health Services Accessibility; D007564:Japan; D011153:Population; D011157:Population Dynamics; D012106:Research; D012494:Sampling Studies
D003276:Contraceptives, Oral
Asia; Contraception; Contraceptive Availability; Contraceptive Methods; Critique; Demographic Factors; Developed Countries; Eastern Asia; Family Planning; Fertility; Fertility Decline; Japan; Kap Surveys; Oral Contraceptives; Oral Contraceptives, Low-dose; Population; Population Dynamics; Research Methodology; Sampling Studies; Studies; Surveys