title: Authors' reply.
authors.affiliation: Anne Duffy, Department of Psychiatry, University of Calgary, Canada. Email: acduffy@ucalgary.ca; Julie Horrocks, Charles Keown-Stoneman, Department of Mathematics and Statistics, University of Guelph, Canada; Sarah Doucette, Department of Community Health and Epidemiology, Dalhousie University, Canada; Paul Grof, Mood Disorders Centre of Ottawa and Department of Psychiatry, University of Toronto, Canada.
authors.forename: Anne
authors.initials: A
authors.lastname: Duffy
authors.affiliation: Anne Duffy, Department of Psychiatry, University of Calgary, Canada. Email: acduffy@ucalgary.ca; Julie Horrocks, Charles Keown-Stoneman, Department of Mathematics and Statistics, University of Guelph, Canada; Sarah Doucette, Department of Community Health and Epidemiology, Dalhousie University, Canada; Paul Grof, Mood Disorders Centre of Ottawa and Department of Psychiatry, University of Toronto, Canada.
authors.forename: Julie
authors.initials: J
authors.lastname: Horrocks
authors.affiliation: Anne Duffy, Department of Psychiatry, University of Calgary, Canada. Email: acduffy@ucalgary.ca; Julie Horrocks, Charles Keown-Stoneman, Department of Mathematics and Statistics, University of Guelph, Canada; Sarah Doucette, Department of Community Health and Epidemiology, Dalhousie University, Canada; Paul Grof, Mood Disorders Centre of Ottawa and Department of Psychiatry, University of Toronto, Canada.
authors.forename: Charles
authors.initials: C
authors.lastname: Keown-Stoneman
authors.affiliation: Anne Duffy, Department of Psychiatry, University of Calgary, Canada. Email: acduffy@ucalgary.ca; Julie Horrocks, Charles Keown-Stoneman, Department of Mathematics and Statistics, University of Guelph, Canada; Sarah Doucette, Department of Community Health and Epidemiology, Dalhousie University, Canada; Paul Grof, Mood Disorders Centre of Ottawa and Department of Psychiatry, University of Toronto, Canada.
authors.forename: Sarah
authors.initials: S
authors.lastname: Doucette
authors.affiliation: Anne Duffy, Department of Psychiatry, University of Calgary, Canada. Email: acduffy@ucalgary.ca; Julie Horrocks, Charles Keown-Stoneman, Department of Mathematics and Statistics, University of Guelph, Canada; Sarah Doucette, Department of Community Health and Epidemiology, Dalhousie University, Canada; Paul Grof, Mood Disorders Centre of Ottawa and Department of Psychiatry, University of Toronto, Canada.
authors.forename: Paul
authors.initials: P
authors.lastname: Grof
mesh_terms: D001714:Bipolar Disorder / Q000453:epidemiology*; D016241:Child of Impaired Parents / Q000706:statistics & numerical data*; D018450:Disease Progression; D005260:Female; D006801:Humans; D008297:Male; D001523:Mental Disorders / Q000453:epidemiology*