Affiliations:
1 Quaid-e-Azam Medical College Bahawalpur, affiliated with University of Health Sciences Lahore, Pakistan.
2 Liaquat National Hospital and Medical College, Affiliated with Jinnah Sindh Medical University Karachi, Pakistan.
3 CMH Lahore Medical and Dental College, affiliated with National University of Medical Sciences, Pakistan
4 Cardiovascular department, St. Elizabeth’s Medical Centre, Boston, USA.
5 Division of Cardiovascular Sciences, University of South Florida Morsani College of Medicine, Heart & Vascular Institute, Tampa General Hospital, Florida, USA.