From the Hermanos Ameijeiras Hospital; National Institute of Oncology and Radiobiology; Center for Medical and Surgical Research; National Institute of Neumology; Center of Molecular Immunology, Havana; Celestino Hernández Hospital, Villa Clara; Third Congress Hospital, Pinar del Río; Maria Curie Hospital, Camagüey, Cuba; V.I. Lenin Hospital, Holguín; and Saturnino Lora Hospital, Santiago de Cuba (2008-03-20時点)