1. Department of Cardiothoracic SurgeryUniversity of Cape Town Medical SchoolCape TownRepublic of South Africa
2. Department of PathologyUniversity of Cape Town Medical SchoolCape TownRepublic of South Africa
3. Department of MedicineUniversity of Cape Town Medical SchoolCape TownRepublic of South Africa
4. Cape Provincial Administration Laboratory for Tissue ImmunologyCape TownRepublic of South Africa
5. Institut d'Immunobiologie, CNRS ER 281, Hopital BroussaisParisFrance