1. INSERM U 776 and Hôpital Paul Brousse, Assistance Publique-Hôpitaux de Paris, Paris, France
2. Data Center, European Organisation for Research and Treatment of Cancer, Brussels, Belgium
3. Istituto Regina Elena, Roma, Italy
4. INSERM U 776, University Paris Sud, and Hôpital Paul Brousse, Assistance Publique-Hôpitaux de Paris, Paris, France