Long-term Results of Resection of the Head of the Pancreas Due to Chronic Pancreatitis: Pancreaticoduodenectomy or Duodenum-preserving Cephalic Pancreatectomy? Sandra Lopez Gordo; Juli Busquets; Nuria Peláez; Lluís Secanella; Laura Martinez-Carnicero; Emilio Ramos; Joan Fabregat;