[1] Natl Univ Singapore, Dept Diagnost Radiol, Singapore 117548, Singapore
[2] Mahidol Univ, Dept Diagnost Radiol, Bangkok 10700, Thailand
[3] Hop Necker Enfants Malad, Dept Pediat Radiol, Paris, France
[4] McMaster Univ, Dept Radiol, Hamilton, ON, Canada
[5] CHU Montreal, Dept Radiol, Montreal, PQ, Canada