1. Department of Clinical Chemistry, St. Jansdal Hospital, Harderwijk, The Netherlands;
2. Department of Internal Medicine, St. Jansdal Hospital, Harderwijk, The Netherlands;
3. Department of Clinical Chemistry, Amsterdam Medical Center (AMC), Amsterdam, The Netherlands;
4. Hemoglobinopathies Laboratory, Department of Clinical Genetics (LDGA), Leiden University Medical Center (LUMC), Leiden, The Netherlands