Inclusion Criteria:  Patients undergoing major open abdominal surgery during the study period (6 months) Patients suffering from chronic pain or using opioids may be included since they are at risk of developing CPSP or POC  Exclusion Criteria:  Patients who have already participated in the study will be excluded as well as patients who will undergo a second surgery after discharge from hospital and before the 90-day deadline for the primary endpoint. Patients undergoing appendectomies, inguinal hernia repair and abdominal wall hernia repair other than incisional hernias.