Association between serum 25-hydroxy vitamin D level and gastric adenocarcinoma – a cross sectional study - Kevin, Arulraj; Anandhi, Amaranathan; Lakshminarayanan, Subitha; Sureshkumar, Sathasivam; Kamalanathan, Sadishkumar (Gastroenterology Review/Przegląd Gastroenterologiczny, 2021)