Acknowledgements
The authors would like to acknowledge the NICU staff at AKU that facilitated and participated in the study: Simon Demas, Hussain Shah, Waqar Hussain, Vinod Parkash, Fayyaz Ahmed, Syed Muzaffar, Saroop Chand, Durre-shawar, Mohammad Hanif, Javaid Iqbal, Aneesa Jahanzeb, and Naureen Lalani. The authors would also like to thank Dr. Tanya Solano for her assistance in ultrasound training as part of this study and Sabrina Kernerman for her assistance in editing the manuscript.