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Recovery stratified by bipolar subtype. The index episode was defined as the most recent or current episode from the date of intake. To ascertain the real duration of illness, time to recovery was calculated from the onset of the index episode. Therefore, for some subjects the duration of episode exceeded the length of prospective follow-up. BP-I indicates bipolar I disorder; BP-II, bipolar II disorder; BP-NOS, bipolar disorder not otherwise specified.
