Variants in the vitamin D pathway, serum levels of vitamin D, and estrogen receptor negative breast cancer among African-American women: A case-control study

Song Yao, Gary Zirpoli, Dana H. Bovbjerg, Lina Jandorf, Chi Chen Hong, Hua Zhao, Lara E. Sucheston, Li Tang, Michelle Roberts, Gregory Ciupak, Warren Davis, Helena Hwang, Candace S. Johnson, Donald L. Trump, Susan E. McCann, Foluso Ademuyiwa, Karen S. Pawlish, Elisa V. Bandera, Christine B. Ambrosone