International trends.
D000328:Adult; D000349:Africa; D000367:Age Factors; D002648:Child; D003906:Developing Countries; D005190:Family; D005260:Female; D006801:Humans; D008297:Male; D008393:Marriage; D001523:Mental Disorders / Q000209:etiology; D009679:Nuclear Family; D012922:Social Change; D012946:Social Welfare