<qa>  What is the VD status of the patient?ETHICS AND SIDE EFFECTS All the patients will have full-filled their investigation, before they are invited to the study. They will be informed of potential adverse effects, and they can leave the trial at any point without any consequences. All participants will be informed and counselling according to their VD status 3 weeks after the surgery. This study poses no additional risk to the patients except for the 5 perioperative blood samples each 8 ml in total 40 ml per patient, as everything else is according to standard clinical practice. 