Rickets and solar radiation - medicine's debt to Professor Frank Mussehl.
D000818:Animals; D002645:Chickens; D002648:Child; D049673:History, 20th Century; D006801:Humans; D009329:Nebraska; D009747:Nutritional Physiological Phenomena; D012279:Rickets / Q000453:epidemiology / Q000209:etiology / Q000266:history*; D014466:Ultraviolet Rays