Social networks and health:  communicable but not infectious.
D000375:Aging; D001294:Attitude to Health; D019058:Community Networks; D005260:Female; D006240:Happiness; D006304:Health Status; D006801:Humans; D007398:Interpersonal Relations; D008132:Loneliness; D008297:Male; D012923:Social Class; D012944:Social Support