title: Together or apart?
authors.forename: David A
authors.initials: DA
authors.lastname: Hay
mesh_terms: D001010:Anxiety, Separation; D002648:Child; D002675:Child, Preschool; D004200:Diseases in Twins; D006801:Humans; D012574:Schools; D012931:Social Environment; D014427:Twins / Q000523:psychology*