[1] Harvard Univ, Sch Med, Massachusetts Gen Hosp, Boston, MA 02114 USA
[2] Cedars Sinai Med Ctr, Los Angeles, CA 90048 USA
[3] Univ N Carolina, Sch Med, Chapel Hill, NC 27599 USA
[4] Univ Naples Federico II, Dept Mol & Clin Endocrinol & Oncol, I-80131 Naples, Italy
[5] Robert Wood Johnson Med Ctr, Canc Inst New Jersey, New Brunswick, NJ 08903 USA
[6] Northwestern Univ, Feinberg Sch Med, Chicago, IL 60611 USA
[7] Eastern Virginia Med Sch, Dept Internal Med, Norfolk, VA 23510 USA
[8] Massachusetts Gen Hosp, Neuroendocrine Unit, Boston, MA 02114 USA