1. Department of Hygiene, Epidemiology and Medical Statistics, Medical School, National and Kapodistrian University of Athens, Athens, Greece.
2. Department of Zoology, University of Oxford, Oxford, United Kingdom.
3. Ivanovsky Institute of Virology, FSBI “N.F. Gamaleya FRCEM” of the Ministry of Health of the Russian Federation, Moscow, Russian Federation.
4. Servicio de Microbiología, Hospital Universitario San Cecilio, Complejo Hospitalario Universitario Granada, Cohorte de Adultos de la Red de Investigación en SIDA—CoRIS, Instituto de Investigación Ibs, Granada, Granada (Andalucía), Spain.