F. Shaikh, A. S. Shaikh, M. M. B. Tufail, H. Bux, and V. Kumari, “Improving Quality Health Care Services by Implementing DMAIC Approach in Paediatric Cardiology Department of Public Hospital of Sindh, Pakistan: A Case Study”, Pak Heart J, vol. 56, no. 4, pp. 278–286, Dec. 2023.