Iwona Rzewnicka, Anna Piotrowska, Barbara Antoniak, Jacek Malejczyk, Anna Hyc, Anna Iwan, and Andrzej Kamiński. 2015. “ The TNF, IL-1, IL-6 and HNP Peritoneal Fluid Concentrations in Premature Infants Treated With Peritoneal Drainage for Intestinal Perforation-Preliminary Study”. Surgical Research – Open Journal 2 (1):47-52. https://openventio.us/index.php/SR/article/view/244.