Any Mortality related to Bariatric Surgery (MORSE Study)

Bariatric Surgery combined with Cholecystectomy or Ventral/Hiatus hernia repair (BLEND Study)

Managment of Leak after Bariatric Surgery (SIGMA Study)

Surgery of Oesophageal Cancer (OUTLIVE Study)

Surgery of Gastric Cancer (HOLD Study)

Surgery of Necrotising Fasciitis of Abdominal Wall (STANMORE Study)

Surgery of Bleeding Peptic Ulcer (INTEL Study)

Surgery of Perforated Ulcer (GRACE Study)