Most advanced at the top
1 Vascular surgery, Thoracic surgery
2 Urology – Prostatectomy, Nephrectomy
3 Obesity surgery, Roux-en-Y Gastric Bypass
4 Endocrine surgery, Spleenectomy
5 Abdominal Wall Surgery, Ventral hernia repairs
6 Small Bowel, Colon and Appendix
7 Liver, Gall bladder
Most basic at the bottom
Jeez, I hope you are not training to become a doctor and using Yahoo answers to complete an assignment…