Inclusion Criteria:  This study involves the extraction of patient records from the enterprise dataware house. As such, we do not stipulate the age limits. Patients who had the following surgeries during over the period of 1 Jan 2017 to 31 December 2020  From the identified surgical procedure type or the following cancer-related procedures:  Breast Colon Liver Rectum  Selected non-cancer surgeries:  Abdominal Wall Gallbladder Patients from SGH and its related institute NCC Only local Singapore Citizens  Exclusion Criteria:  No exclusion criteria