1. Dipartimento di Chirurgia (Anatomia Patologica), Università di Pisa, Via Roma 57, 56126 Pisa, Italy
2. Institudo Universitario de Bio-Organica “Antonio Gonzales”, Universidad de La Laguna, Avda. Astrofisico F. Sánchez 2, La Laguna, 38206-Tenerife, Spain
3. Department of Medical Oncology, VU University Medical Center, De Boelelaan 1117, 1081 HV Amsterdam, The Netherlands
4. Department of Chemistry, University of Illinois, 600 S. Mathews Avenue, Urbana, Illinois 61801, United States