[1] Univ Zurich, Childrens Hosp, Div Hematol Immunol, CH-8032 Zurich, Switzerland
[2] Univ Zurich, Childrens Hosp, Div Radiol, CH-8032 Zurich, Switzerland
[3] Univ Zurich Hosp, Div Nucl Med, CH-8091 Zurich, Switzerland
[4] Paul Scherrer Inst, Dept Life Sci, Villigen, Switzerland