title: Serum vitamin D levels and response to molecular subtypes in breast cancer.
authors.affiliation: Diskapi Yildirim Beyazit Education and Research Hospital, Ankara, Turkey.
authors.forename: Suleyman
authors.initials: S
authors.lastname: Sahin
authors.affiliation: Diskapi Yildirim Beyazit Education and Research Hospital, Ankara, Turkey.
authors.forename: Fatih
authors.initials: F
authors.lastname: Karatas
authors.affiliation: Hacettepe Univesity School of Medicine, Department of Radiology, Ankara, Turkey.
authors.forename: Ali R
authors.initials: AR
authors.lastname: Sever
authors.affiliation: Hacettepe University Cancer Institute, Department of Medical Oncology, 06100 Ankara, Turkey. Electronic address: altundag66@yahoo.com.
authors.forename: Kadri
authors.initials: K
authors.lastname: Altundag