1. IMO Clin de Genolier, Genolier, Switzerland; Martin-Luther-University Halle/Wittenberg, Halle/Saale, Germany; Inst de Oncologia Hematologia, Caracas, Venezuela; Asklepios Fachkliniken, Gauting, Germany; Merck Research Labs, Brussels, Belgium; Merck & Co., Inc., West Point, PA