1Dept. of Anatomy, Sri Guru Ram Das Institute of Medical Sciences and Research, Amritsar, Punjab, India, 2Dept. of Anatomy, Govt. Medical College, Amritsar, Punjab, India, 3Dept. of Pathology, Sri Guru Ram Das Institute of Medical Sciences and Research, Amritsar, Punjab, India, 4Dept. of Pharmacology, Govt. Medical College, Amritsar, Punjab, India, 5Dept. of Anatomy, Post Graduate Institute of Medical Sciences, Jalandhar, Punjab, India