1. McMaster University; Clinical Epidemiology and Biostatistic Department; 1280 Main Street West CRL - 140 Hamilton ON Canada L8S 4K1
2. University of Perugia; Department of Internal Medicine; Ospedale Santa Maria della Misericordia Località Sant'Andrea delle Fratte Perugia Italy 06126
3. University of Alberta; Northern Alberta Children's Cancer Program, Department of Pediatrics; Room 7327A Aberhart Centre 11402 University Avenue NW Edmonton Alberta Canada T6G 2J3
4. McMaster University; Division of Pediatric Hematology/Oncology, Health Sciences Centre; 1200 Main Street West Hamilton Ontario Canada L8N 3Z5