High levels of reactive oxygen species in pancreatic necrotic fluid of patients with walled-off pancreatic necrosis - Lukasz Rojek; Areta Hebanowska; Magdalena Stojek; Mateusz Jagielski; Elzbieta Goyke; Sylwia Szrok-Jurga; Marian Smoczynski; Julian Swierczynski; Tomasz Sledzinski; Krystian Adrych (Gastroenterology Review)