1. Association of American Medical Colleges. Inside the neonatal intensive care unit: research advances care for hospitals’ smallest patients. 2015. Available at: www.aamc.org/newsroom/reporter/january2015/422214/neonatal-care.html. Accessed December 18, 2015.
2. Centers for Disease Control and Prevention. Preterm birth. 2015. Available at: www.cdc.gov/reproductivehealth/maternalinfanthealth/pretermbirth.htm. Accessed December 20, 2015.
3. Centers for Disease Control and Prevention. Morbidity and mortality weekly report. 2013. Available at: www.cdc.gov/mmwr/preview/mmwrhtml/mm6231a3.htm. Accessed December 18, 2015.
4. The normal electrocardiogram in the newborn and neonatal period and its progression;Liebman;J Electrocardiol,2010
5. Normal ranges of heart rate and respiratory rate in children from birth to 18 years: a systematic review of observational studies;Fleming;Lancet,2011