title: Response to the letter by Guogen Shan and Hua Zhang (response to letter commenting: J Clin Epidemiol. 2015;68:733-739).
authors.affiliation: Division of Pediatric Medicine and the Pediatric Outcomes Research Team (PORT), Department of Pediatrics and Child Health Evaluative Sciences, The Hospital for Sick Children, Peter Gilgan Centre for Research and Learning, 686 Bay St., Toronto, Ontario, M5G 0A4, Canada; Women's College Research Institute, Women's College Hospital, 7th Floor, 790 Bay St., Toronto, Ontario, M5G 1N8, Canada; Institute of Health Policy, Management and Evaluation, University of Toronto, 155 College St., Suite 425, Toronto, Ontario, M5T 3M6, Canada. Electronic address: cattales@sympatico.ca.
authors.forename: Cornelia M
authors.initials: CM
authors.lastname: Borkhoff
authors.affiliation: Clinical Research Program, Children's Hospital Boston, 300 Longwood Avenue, Boston, MA 02115, USA.
authors.forename: Patrick R
authors.initials: PR
authors.lastname: Johnston
authors.affiliation: Child Health Evaluative Sciences, The Hospital for Sick Children, Peter Gilgan Centre for Research and Learning, 686 Bay St., Toronto, Ontario, M5G 0A4, Canada; Department of Biostatistics, Dalla Lana School of Public Health, University of Toronto, 6th Floor, 155 College St., Toronto, Ontario, M5T 3M7, Canada.
authors.forename: Derek
authors.initials: D
authors.lastname: Stephens
authors.affiliation: Department of Biostatistics, Dalla Lana School of Public Health, University of Toronto, 6th Floor, 155 College St., Toronto, Ontario, M5T 3M7, Canada; Department of Biostatistics, Princess Margaret Cancer Center, University Health Network, 610 University Avenue, Toronto, Ontario, M5G 2M9, Canada.
authors.forename: Eshetu
authors.initials: E
authors.lastname: Atenafu
mesh_terms: D004812:Epidemiologic Methods; D018401:Sample Size