[1] Med Coll Wisconsin, Dept Dermatol, Div Pediat Dermatol, Milwaukee, WI 53226 USA
[2] Vasc Birthmark Inst New York, New York, NY USA
[3] Univ Toronto, Dept Paediat, Div Haematol Oncol, Toronto, ON M5S 1A1, Canada
[4] Northwestern Univ, Dept Pediat, Feinberg Sch Med, Div Hematol Oncol Stem Cell Transplantat, Chicago, IL 60611 USA
[5] Med Coll Wisconsin, Dept Pediat, Div Hematol Oncol Blood & Marrow Transplant, Milwaukee, WI 53226 USA
[6] Oregon Hlth & Sci Univ, Dept Dermatol, Div Pediat Dermatol, Portland, OR 97201 USA
[7] Northwestern Univ, Dept Dermatol, Feinberg Sch Med, Div Pediat Dermatol, Chicago, IL 60611 USA
[8] Baylor Coll Med, Dept Dermatol, Div Pediat Dermatol, Houston, TX 77030 USA
[9] Oregon Hlth & Sci Univ, Dept Pediat, Div Hematol Oncol, Portland, OR 97201 USA
[10] Georgetown Univ, Dept Pediat, Div Pediat Dermatol, Washington, DC 20057 USA
[11] Univ Calif San Diego, Dept Med, Div Dermatol, San Diego, CA 92103 USA
[12] Univ Toronto, Dept Paediat, Div Paediat Med, Dermatol Sect, Toronto, ON M5S 1A1, Canada