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Procedures included in each cluster
| Cluster | Procedure |
|---|---|
| Cardiac | Coronary artery bypass graft |
| Cardiac valve replacement | |
| GI | Colon |
| Herniorrhaphy | |
| Joint | Knee arthroplasty |
| Hip arthroplasty | |
| OB-GYN | Cesarean section |
| Hysterectomy | |
| Vaginal hysterectomy | |
| Spine | Spinal fusion |
| Laminectomy | |
| Vascular | Carotid endarterectomy |
| Peripheral venous bypass |
