The need for vitamin-D supplements.
D000328:Adult; D000367:Age Factors; D000368:Aged; D002648:Child; D002762:Cholecalciferol / Q000096:biosynthesis; D006801:Humans; D010018:Osteomalacia / Q000453:epidemiology / Q000209:etiology; D010024:Osteoporosis / Q000453:epidemiology; D012279:Rickets / Q000453:epidemiology / Q000209:etiology; D012737:Sex Factors; D014466:Ultraviolet Rays; D006113:United Kingdom; D014807:Vitamin D / Q000627:therapeutic use*; D014808:Vitamin D Deficiency / Q000150:complications / Q000517:prevention & control*
D014807:Vitamin D; D002762:Cholecalciferol