Fecal elastase-1 and 13C-mixed triglyceride breath test vs. coefficient of fat absorption to diagnose exocrine pancreatic insufficiency after pancreatic surgery Paula Sirera-Sirera; Núria Lluís; Fèlix Lluís; Pedro Zapater; Pablo López-Guillén; José M. Ramia-Ángel; Rahma Amrani; Trinidad Castillo-García; José Andreu-Viseras; Karina Cárdenas-Jaén; Lucía Guilabert; Sara Pérez-Brotons; Emma Martínez-Moneo; Nerea Gendive-Martin; Iván González Hermoso; Enrique de-Madaria; María José Ferri;