TY - JOUR TI - Impaired heart rate variability in patients with mitral annular calcification: an observational study AU - Kurtoğlu, E. AU - Aktürk, E. AU - Korkmaz, H. AU - Ataş, H. AU - Pekdemir, H. JO - The Anatolian Journal of Cardiology PY - 2013 VL - 13 SP - 668 EP - 674 DO - 10.5152/akd.2013.189 ER -