Ultraviolet deprivation.
D001847:Bone Diseases / Q000209:etiology* / Q000378:metabolism; D001842:Bone and Bones / Q000378:metabolism; D002762:Cholecalciferol / Q000096:biosynthesis; D006801:Humans; D010018:Osteomalacia / Q000532:radiotherapy; D012279:Rickets / Q000532:radiotherapy; D014466:Ultraviolet Rays; D014467:Ultraviolet Therapy; D014808:Vitamin D Deficiency / Q000150:complications
D002762:Cholecalciferol