Rickets.
D000397:Air Pollution; D000818:Animals; D004285:Dogs; D004872:Ergocalciferols / Q000096:biosynthesis*; D005060:Europe; D005843:Geography; D005858:Germany; D049672:History, 19th Century; D049673:History, 20th Century; D010858:Pigmentation; D051381:Rats; D012279:Rickets / Q000209:etiology* / Q000266:history; D012621:Seasons; D013472:Sunlight; D006113:United Kingdom; D014481:United States; D014808:Vitamin D Deficiency
D004872:Ergocalciferols