Cystic Fibrosis / Pancreatitis / Diarrhea / Humans / Child / Male / Differential Diagnosis / Acute Pancreatitis / Chronic Pancreatitis / Public health systems and services research / Viral Infection / Exocrine Pancreatic Insufficiency / Male / Differential Diagnosis / Acute Pancreatitis / Chronic Pancreatitis / Public health systems and services research / Viral Infection / Exocrine Pancreatic Insufficiency