[1] Harvard Univ, Sch Med,Dana Farber Canc Inst, Dept Adult Oncol,Translat Res Lab, Charles A Dana Human Canc Genet Unit, Boston, MA 02115 USA
[2] Univ Cambridge, Canc Res Campaign, Human Canc Genet Res Grp, Cambridge CB2 2QQ, England
[3] Columbia Univ Coll Phys & Surg, Dept Dermatol, New York, NY 10032 USA
[4] Columbia Univ Coll Phys & Surg, Dept Med, New York, NY 10032 USA