title: Preface.
authors.affiliation: Emma Pendleton Bradley Hospital, Alpert Medical School of Brown University, 1011 Veteran's Memorial Pkwy, East Providence, RI 02914, USA. Jeffrey_hunt@brown.edu
authors.forename: Jeffrey I
authors.initials: JI
authors.lastname: Hunt
authors.forename: Daniel P
authors.initials: DP
authors.lastname: Dickstein
mesh_terms: D000293:Adolescent; D000296:Adolescent Psychiatry / Q000379:methods*; D000339:Affect; D001714:Bipolar Disorder / Q000175:diagnosis* / Q000453:epidemiology / Q000523:psychology; D002648:Child; D002665:Child Psychiatry / Q000379:methods*; D006801:Humans