1. Department of Obstetrics, Gynaecology and Reproduction, Faculty of Veterinary Science, Chulalongkorn University, Bangkok 10330, Thailand
2. Department of Pathology, Faculty of Veterinary Science, Chulalongkorn University, Bangkok 10330, Thailand
3. Department of Veterinary Clinical and Animal Sciences, Faculty of Health and Medical Sciences (SUND), University of Copenhagen, DK-1870 Frederiksberg C, Denmark
4. Allergy and Clinical Immunology Unit, Department of Medicine, Faculty of Medicine, Chulalongkorn University, Bangkok 10330, Thailand