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Doulberis M, Papaefthymiou A, Kountouras J, Polyzos SA, Srivastava S, Klukowska-Rötzler J, Perrig M, Papoutsi S, Exadaktylos AK, Srivastava DS. Vitamin D Deficiency and Unclear Abdominal Pain in Patients from Low- and Middle-Income Countries. International Journal of Environmental Research and Public Health. 2019; 16(23):4607. https://doi.org/10.3390/ijerph16234607

Doulberis, Michael, Apostolis Papaefthymiou, Jannis Kountouras, Stergios A. Polyzos, Simone Srivastava, Jolanta Klukowska-Rötzler, Martin Perrig, Sylvana Papoutsi, Aristomenis K. Exadaktylos, and David Shiva Srivastava. 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, no. 23: 4607. https://doi.org/10.3390/ijerph16234607

Doulberis, M., Papaefthymiou, A., Kountouras, J., Polyzos, S. A., Srivastava, S., Klukowska-Rötzler, J., Perrig, M., Papoutsi, S., Exadaktylos, A. K., & Srivastava, D. S. (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), 4607. https://doi.org/10.3390/ijerph16234607