Vitamin K-dependent proteins in patients undergoing head and neck free flap surgery – a prospective observational study​Karolina Persson Caroline Ulfsdotter Nilsson Johanna Sjövall Louise Walther Sturesson Leon Schurgers Thomas Kander a Department of Intensive and Perioperative Care, Skåne University Hospital, Lund, Swedenb Department of Clinical Sciences Lund, Lund University, Lund, Swedenc Department of Otorhinolaryngology, Head and Neck Surgery, Skåne University Hospital, Lund, Swedend Department of Biochemistry, Cardiovascular Research Institute Maastricht, Maastricht University, Maastricht, The Netherlandson June 27, 2026 at 6:11 am