Table 4.

Dates of patient data from each hospital^a

Hospital	First patient	Last patient
Hospital for Sick Children, Toronto, ON, Canada	16 March 2004	17 March 2008
Birmingham Children's Hospital, Birmingham, UK	21 August 2004	17 October 2006
Stollery Children's Hospital, Edmonton, AB, Canada	14 March 2006	26 April 2008
Saint Justine Hospital, Montreal, QC, Canada	3 April 2007	7 January 2009

^aDates given are the earliest and latest dates that patient data were obtained at each hospital.