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Literature quality evaluation.
| The first author | Year | n | Type of surgery | NOS score |
|---|---|---|---|---|
| Schmittel | 2016 | 87 | Spinal operation | 6 |
| Hanna | 2008 | 100 | Cardiosurgery | 8 |
| Lara | 2014 | 50 | Intestinal surgery | 6 |
| Noda | 2015 | 78 | Knee prosthesis | 6 |
| Zatloukal | 2016 | 168 | Gastric operation | 6 |
| Shi Y | 2012 | 69 | Hip surgery | 6 |
| Rong Lin | 2012 | 46 | Hip surgery | 6 |
