Mendelian Randomization (MR) experiments using the genetic variations associated with serum 25OHD as instrumental variables have been conducted to investigate the causative role of vitamin D in COVID-19 risk. Continue Reading: https://bit.ly/3fBpMYP For our services: https://pubrica.com/services/physician-writing-services/orginal-research-article/ Why Pubrica: When you order our services, we promise you the following – Plagiarism free | always on Time | 24*7 customer support | Written to international Standard | Unlimited Revisions support | Medical writing Expert | Publication Support | Bio statistical experts | High-quality Subject Matter Experts.   Contact us:      Web: https://pubrica.com/  Blog: https://pubrica.com/academy/  Email: [email protected]  WhatsApp : +91 9884350006  United Kingdom: +44-1618186353