In addition to Kraepelin, Adolf Meyer, Karl Abraham, and Melanie Klein were some of the first to document BD symptoms in children in the first half of the 20th century. In general though, it was considered exceedingly rare and was not mentioned much in the literature until the 1970s when interest in researching the subject increased. It became more accepted as a diagnosis in children in the 1980s after the DSM-III (1980) specified that the same criteria for diagnosing BD in adults could be also be applied to children.[2]