The arsenic problems.
D000818:Animals; D001151:Arsenic / Q000172:deficiency / Q000266:history; D020261:Arsenic Poisoning; D001152:Arsenicals / Q000009:adverse effects; D004032:Diet; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D009369:Neoplasms / Q000139:chemically induced*; D009784:Occupational Diseases / Q000209:etiology; D012643:Selenium / Q000378:metabolism; D013483:Superstitions
D001152:Arsenicals; D012643:Selenium; D001151:Arsenic