1. Julio Trigo Hospital, Havana, Cuba
2. Salvador Allende Hospital, Havana, Cuba
3. Medical & Surgical Research Center (CIMEQ), Havana, Cuba
4. Luis Díaz Soto Hospital, Havana, Cuba
5. National Institute of Hematology & Immunology, Havana, Cuba
6. Center of Molecular Immunology (CIM), Havana, Cuba