Vitamin D: The More We Know, the Less We Know (great title, but behind paywall)

Clin Chem. 2014 Jul 23. pii: clinchem.2014.222521. [Epub ahead of print]

Scott MG1, Gronowski AM2, Reid IR3, Holick MF4, Thadhani R5, Phinney K6.

$15 paywall