| Title | Link |
|---|---|
| Online Social Networks and Media | 
|
| Operations Research for Health Care |
|
| Operations Research Letters |
|
| Operative Techniques in Cardiac and Thoracic Surgery |
|
| Operative Techniques in General Surgery |
|
| Operative Techniques in Neurosurgery |
|
| Operative Techniques in Orthopaedics |
|
| Operative Techniques in Otolaryngology-Head and Neck Surgery |
|
| Operative Techniques in Plastic and Reconstructive Surgery |
|
| Operative Techniques in Sports Medicine |
|
