[1] Jahangirnagar Univ, Dept Stat, Dhaka 1342, Bangladesh
[2] Newcastle Univ, Sch Math Stat & Phys, Newcastle Upon Tyne, England
[3] Canc Care & Res Trust Bangladesh CCRTB, Dhaka 1204, Bangladesh
[4] Sichuan Univ, Fac Comp Sci & Informat Technol, Dept Software Engn, Chengdu, Peoples R China
[5] Univ Cincinnati, Coll Med, Dept Environm & Publ Hlth Sci, Div Biostat & Bioinformat, Cincinnati, OH USA
[6] Charles Sturt Univ, Sch Comp Math & Engn, Wagga Wagga, NSW 2678, Australia
[7] Texas Tech Univ, Dept Math & Stat, 1108 Mem Circle, Lubbock, TX 79409 USA