1. Women's College Hospital, University of Toronto, and ICES, Toronto, Ontario, Canada (V.G.)
2. University of Toronto, Toronto, Ontario, Canada (D.B.)
3. University of Toronto and Sinai Health System, Toronto, Ontario, Canada (M.T.W.)
4. University of Toronto and University Health Network, Toronto, Ontario, Canada (I.I.B.)
5. Women's College Hospital, University of Toronto, and Sinai Health System, Toronto, Ontario, Canada (N.M.S.)