Acknowledgements
This article was extracted from Mohammad Sadegh Mobaraki's MSc thesis. Hereby, we acknowledge our sincere gratitude to this deputy, clinical research development center in Namazi Hospital and Dr. Marjan Faghih and Ms. Shima Miladi for their cooperation in determining the sample size and statistical data analysis. We also sincerely thank the officials of Kowsar hospital in Shiraz and the personnel of cardiac care units in this hospital.