1. Department of Statistics, Quaid-i-Azam University, Islamabad, Pakistan;
2. Johann Bernoulli Institute (JBI) Rijksuniversiteit Groningen, Groningen, The Netherlands;
3. Faculty of Health Studies, University of Bradford, Bradford, UK;
4. Bradford Teaching Hospitals NHS Foundation Trust, Bradford Institute for Health Research, Bradford, UK;
5. Arriyadh Community College King Saud University, Riyadh, Saudi Arabia;
6. College of Business Administration, King Saud University Muzahimiyah, Al Muzahimiyah, Saudi Arabia;
7. Department of Statistics, Bahauddin Zakariya University, Multan, Pakistan