[1] Thomas Jefferson Univ, Dept Dermatol & Cutaneous Biol, Philadelphia, PA 19107 USA
[2] Jefferson Clin Res Inst, Philadelphia, PA USA
[3] Onconova Therapeut, Newtown, PA USA
[4] Onconova Therapeut Inc, Montgomery, TX USA
[5] Paracelsus Med Univ Salzburg, Dept Dermatol & Allergol, Salzburg, Austria
[6] Dept Dermatol & Cutaneous Biol, Philadelphia, PA USA