Sponsorships or competing interests that may be relevant to content are disclosed at the end of this article.
aDevelopmental Neurosciences and Child Health, Child and Family Research Institute, Vancouver, BC, Canada
bDepartment of Occupational Science and Occupational Therapy, University of British Columbia, Vancouver, BC, Canada
cDepartment of Pediatrics, University of British Columbia, Vancouver, BC, Canada
dDepartment of Statistics, University of British Columbia, Vancouver, BC, Canada
*Corresponding author. Address: Developmental Neurosciences and Child Health, F611, 4480 Oak Street, Vancouver, BC, Canada V6H 3V4. Tel.: +1 604 875 2000; fax: +1 604 875 2384.
E-mail address:lholsti@cw.bc.ca
Submitted May 17, 2011; revised July 18, 2011; accepted July 26, 2011.
