Kumar, N., Kaushik, S. L., Grover, N., & Sharma, R. L. (2016). Retinopathy of prematurity: incidence and risk factors: a hospital based study from Shimla, Himachal Pradesh, India. International Journal of Research in Medical Sciences, 5(1), 56–61. https://doi.org/10.18203/2320-6012.ijrms20164400