1. Division of Transplant Pathology; Thomas E. Starzl Transplantation Institute, University of Pittsburgh Medical Center; Pittsburgh PA USA
2. Department of Immunohematology; Leiden University Medical Center; Leiden The Netherlands
3. Department of Informatics and Statistics; Federal University of Piauí; Teresina Brazil
4. Immunogenetics and Molecular Biology Laboratory; Federal University of Piauí; Teresina Brazil