1. Special Coagulation Laboratory; Division of Hematopathology; Department of Laboratory Medicine and Pathology; Mayo Clinic; Rochester MN USA
2. Department of Otolaryngology, Head and Neck Surgery; University of Minnesota; Minneapolis MN USA
3. Division of Pediatric Hematology Oncology; Department of Pediatric and Adolescent Medicine; Mayo Clinic; Rochester MN USA
4. Division of Pediatric Otolaryngology; Department of Otolaryngology, Head and Neck Surgery; Mayo Clinic; Rochester MN USA