[1] Univ Hosp Ctr, Lausanne, Switzerland
[2] Univ Lausanne, Lausanne, Switzerland
[3] Univ Western Ontario, London, ON, Canada
[4] Univ Hosp Ctr, Clin Neuroradiol, Lausanne, Switzerland
[5] Univ Toronto, Toronto, ON, Canada
[6] Hosp Sick Children, Toronto, ON, Canada