@article{article4338,
  title = {Could decreased vitamin D levels be related with impaired cardiac autonomic functions in patients with chronic heart failure:  an observational study},
  author = {Çetin, M. and Kozdağ, G. and Ural, D. and Kahraman, G. and Yılmaz, İ. and Akay, Y. and Onuk, R. and Dursun, N.},
  journal = {The Anatolian Journal of Cardiology},
  year = {2014},
  volume = {14},
  pages = {434-441},
  doi = {10.5152/akd.2014.4869}
}