1. UK NEQAS for Leucocyte Immunophenotyping (UK NEQAS LI); Department of Haematology; Royal Hallamshire Hospital; Sheffield United Kingdom
2. Laboratory Medicine Program; Toronto General Hospital; Toronto Ontario Canada
3. Haematological Malignancy Diagnostic Service; St James's University Hospital; Leeds United Kingdom
4. Pathology and Laboratory Medicine; London Health Sciences; London Ontario Canada
5. Department of Pathology and Oncology; Johns Hopkins Medical Institutions; Baltimore Maryland
6. Dahl-Chase Diagnostic Services; Bangor Maine