1. Department of Pathology; Canisius Wilhelmina Hospital; P.O. Box 9015 6500 GS Nijmegen
2. Department of Pathology; Radboud University Medical Center; P.O. Box 9101 6500 HB Nijmegen
3. Department of Pathology; Maastricht University Medical Center; P.O. Box 5800 6202 AZ Maastricht
4. Department of Pathology; VU University Medical Center; P.O. Box 7057 1007 MB Amsterdam