Search for: [Subject = medycyna] OR [Subject = nauki medyczne] OR [Title = Elevated tumor marker CA 19\-9 in the differential diagnosisof pancreatic mass lesions] OR [Creator = Ćwik, Grzegorz.] OR [Creator = Wallner, Grzegorz.] OR [Creator = Skoczylas, Tomasz.] OR [Creator = Krzyżanowski, Maciej.] OR [Creator = Ciechański, Aleksander \(medycyna\).] OR [Creator = Mądro, Przemysław.]