Pretherapeutic work-up will include detailed medical history (including date of the first episode of typical abdominal pain, date of diagnosis of CP, number of episodes of pain during the last year, alcohol intake, pain continuous or intermittent during the last episode, medication, intensity of the last episode of pain on a 10-point scale as previously described), blood chemistry, stool sampling (for elastase measurement), triolein breath test, plain abdominal film taken in four classical positions (left anterior oblique, right anterior oblique, lateral, and supine), CT Scan without contrast medium injection, and secretin-enhanced magnetic resonance cholangiopancreatography (S-MRCP).