Lingard Lorelei, Albert Mathieu, Levinson Wendy
SickKids Learning Institute and Department of Paediatrics and Wilson Centre for Research in Education, University of Toronto, 200 Elizabeth Street, Eaton South 1-565, Toronto, ON, Canada M5G 2C4.
BMJ. 2008 Aug 7;337:a567. doi: 10.1136/bmj.39602.690162.47.