1. Division of Preventive Oncology, National Center for Tumor Diseases, German Cancer Research Center (DKFZ), Heidelberg, Germany
2. Departamento de Química Orgânica e Inorgânica, Universidade Federal do Ceará, Fortaleza, Brazil
3. Institute of Chemistry and Faculty of Pharmaceutical Sciences, University of Campinas, Campinas, Brazil
4. Division of Cancer Population Science, Huntsman Cancer Institute, Salt Lake City, Utah, USA