Literature search:
The search engines such as “Google Scholar”, “Medline and PubMed” were used by applying some search key terms; “Vitamin D Pakistan”, “Vitamin D diseases Pakistan”, “Vitamin D deficiency Pakistan”, “Vitamin D tuberculosis Pakistan”, “Vitamin D Children Pakistan”, “Vitamin D rickets Pakistan”, Vitamin D Women Pakistan”, “Vitamin D Cancer Pakistan” and “Vitamin D receptor SNPs Pakistan”.