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Parva, Naveen R., Satish Tadepalli, Pratiksha Singh, Andrew Qian, Rajat Joshi, Hyndavi Kandala, Vinod K. Nookala, and Pramil Cheriyath. "Prevalence of Vitamin D Deficiency and Associated Risk Factors in the US Population (2011-2012)." Cureus 2018.

Parva, Naveen R., et al. "Prevalence of Vitamin D Deficiency and Associated Risk Factors in the US Population (2011-2012)." Cureus 2018.