1. Tumour Virology Division F010 (A.M.), German Cancer Research Center, 69120 Heidelberg, Germany
2. Department of Oncology (A.M.), Luxembourg Institute of Health 84, rue Val Fleuri L-1526, Luxembourg
3. Department of Pediatrics (T.O.), Hamamatsu University School of Medicine, Higashi-ku, Hamamatsu 431-3192, Japan
4. Department of Human Molecular Genetics (G.A.R.), Institute of Human Genetics, Heidelberg University Hospital, 69120 Heidelberg, Germany