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- Department of Herd Health and Reproduction, Faculty of Veterinary Medicine, Utrecht University, P.O. Box 80151, 3508 TD Utrecht, the Netherlands.
- Animal Health Service in the Eastern Netherlands, P.O. Box 9, 7400 AA, Deventer, the Netherlands .
- Animal Health Service in the Southern Netherlands, P.O. Box 4, 5280 AA Boxtel, the Netherlands.