Acknowledgements
The authors would like to thank the Research Deputy of Babol University of Medical Sciences for financially supporting the project and sincere cooperation of Ms. Malakouti – the head nurse of Neonatology Intensive Care Unit – the respective personnel of NICU and NHU, Mr. Banihashemi and Ms. Azizi and other personnel of genetic laboratory of Amirkola Hospital, as well as Dr. Alizadeh for assisting with statistical analysis of the study.