Pulmonary Division-Heart Institute (InCor), Hospital das Clínicas da Faculdade de Medicina de São Paulo, São Paulo, Brazil. Haematology Department, British Hospital of Buenos Aires, Buenos Aires, Argentina. Servicio de Hematología, Hospital Universitario "Dr José E González", Universidad Autónoma de Nuevo León, Monterrey, Mexico. Hematology Department, Instituto Nacional de Cancerología, Mexico City, Mexico. Cancer Unit, Hospital Pablo Tobón Uribe, Medellín, Colombia. Unit of Angiology, 28130Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil. Vascular Medicine and Thrombosis Service, Instituto Universitario de Ciencias Biomedicas de Córdoba (IUCBC), Córdoba, Argentina. Clinical Oncology Unit, Clínica del Country, Bogotá, Colombia. Thoracic Oncology Service, 5803Memorial Sloan Kettering Cancer Center, New York, NY, USA. Medical Oncology, Centro de Investigación y Manejo del Cáncer (CIMCA), San José, Costa Rica. Department of Haematological Medicine, Guy's and St Thomas' Hospitals NHS Foundation Trust, King's College London, UK.