Journal Pre-proof Vitamin D deficiency in Kazakhstan: cross-sectional study Olga Gromova (Conceptualization) (Methodology), Aikerm Doschanova (Validation) (Conceptualization) (Resources)<ce:contributor-role>Data Curation), Vyacheslav Lokshin (Validation) (Conceptualization) (Resources), Ainur Tuletova (Investigation) (Resources), Galina Grebennikova (Methodology) (Investigation)<ce:contributor-role>Data Curation), Laura Daniyarova (Methodology) (Investigation)<ce:contributor-role>Data Curation) (Resources), Gulnaz Kaishibayeva (Validation) (Conceptualization) (Resources), Tair Nurpeissov (Validation) (Conceptualization) (Resources), Viktoriya Khan (Resources), Yuliya Semenova (Conceptualization) (Validation) (Formal analysis)<ce:contributor-role>Writing - Original Draft)<ce:contributor-role>Writing - Review and Editing), Albina Chibisova (Conceptualization) (Methodology)<ce:contributor-role>Data Curation) (Supervision) (Project administration) (Funding acquisition), Natalia Suzdalskaya (Conceptualization) (Methodology)<ce:contributor-role>Data Curation) (Supervision), Zhanara Aitaly (Conceptualization) (Methodology), Natalia Glushkova (Project administration) (Methodology) (Software) (Formal analysis)<ce:contributor-role>Writing - Original Draft)<ce:contributor-role>Writing - Review and Editing) PII: S0960-0760(19)30567-9 DOI: https://doi.org/10.1016/j.jsbmb.2019.105565 Reference: SBMB 105565 To appear in: Journal of Steroid Biochemistry and Molecular Biology