Tubman Michelle, Majumdar Sumit R, Lee Daniel, Friesen Carol, Klassen Terry P
Alberta Research Centre for Child Health Evidence, Room 9419 4th Floor, Aberhart Centre One, 11402 University Avenue, Edmonton Alberta, Canada T6G 2J3.
BMJ. 2005 Jul 30;331(7511):274-7. doi: 10.1136/bmj.331.7511.274.