Drobotun, Oleg, Ternovy Мykola, and Kolotilov Мykola. “SERUM VITAMIN D IN PATIENTS WITH BENIGN, PRIMARY MALIGNANT AND METASTATIC BONE TUMORS”. ORTHOPAEDICS TRAUMATOLOGY and PROSTHETICS, no. 2 (September 11, 2023): 50–55. Accessed May 20, 2024. http://otp-journal.com.ua/article/view/283092.