Velayudhan, A., Seshadri, S., Jagadeesan, S., Saravanan, J., Yadav, R. and Yeung, L.F. 2021. Evaluation of a hospital-based surveillance system for birth defects in Chennai, India. International Journal Of Community Medicine And Public Health. 8, 11 (Oct. 2021), 5484–5488. DOI:https://doi.org/10.18203/2394-6040.ijcmph20214293.