title: Authors' reply.
authors: Department of Physiology, Pt. B.D. Sharma University of Health Sciences, Rohtak, Haryana, India E-mail: dr_jyotisethi@rediffmail.com.
authors: Jyoti
authors: J
authors: Sethi
authors: Mridul
authors: M
authors: Yadav
authors: Sushma
authors: S
authors: Sood
authors: Kiran
authors: K
authors: Dahiya
authors: Veena
authors: V
authors: Singh