1. ALTANA Pharma AG, 78465 Konstanz, Germany.
2. Department of Oncology, Albert Einstein-Montefiore Cancer Center, Bronx, NY 10467.
3. Fachhochschule beider Basel, 4132 Muttenz, Switzerland.
4. Department of Pediatric Oncology & Hematology, Ernst Moritz Arndt University, Greifswald, Germany.