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Doulberis, Michael; Papaefthymiou, Apostolis; Kountouras, Jannis; Polyzos, Stergios A; Srivastava, Simone; Klukowska-Rötzler, Jolanta; Perrig, Martin; Papoutsi, Sylvana; Exadaktylos, Aristomenis K.; Srivastava, David Shiva (2019). Vitamin D Deficiency and Unclear Abdominal Pain in Patients from Low- and Middle-Income Countries. International journal of environmental research and public health, 16(23), pp. 1-13. MDPI 10.3390/ijerph16234607
