1. CICS-UBI, Health Sciences Research Centre; University of Beira Interior; Covilhã Portugal
2. UMIB-ICBAS, Unit for Multidisciplinary Research in Biomedicine; Institute for Biomedical Sciences Abel Salazar; University of Porto; Rua Jorge Viterbo Ferreira; 4050-313 Porto Portugal
3. Center for Biomedical Research, Population Council; 1230 York Avenue New York New York 10065