Table 1 Study characteristics of included primary studies
Study ID | Study design | Tumor location | Sample Size | Country | Setting | |
|---|---|---|---|---|---|---|
1 | Chen et al. 2000 [20] | Non-randomized controlled triala (with a historical control group) | Unilateral neck dissection | 190 | USA | Academic cancer Center, secondary/tertiary care |
2 | Dahl et al. 2017 [25] | Non-randomized controlled triala (with a historical control group) | Cancer patients (colorectal, lung, melanoma, breast, prostate, and other) | 3292 | Denmark | Danish hospitals, primary and secondary care |
3 | Gendron et al. 2002 [21] | Interrupted time series studya | Head and neck cancer surgery | 212 | USA | Tertiary care academic medical center |
4 | Ghosh et al. 2001 [22] | Interrupted time series studya | Hysterectomy cervical or endometrial cancer | 151 | USA | Academic Medical Center, tertiary care |
5 | Jeong et al. 2011 [23] | Non-randomized controlled triala | Treatment of gastric cancer (early vs. advanced; non-CP vs. CP) | 631 | Korea | Unclear, secondary care |
6 | Kiyama et al. 2003 [18] | Randomized controlled trial | Gastric cancer | 85 | Japan | Nippon Medical School Hospital, secondary care |
7 | Tastan et al. 2012 [24] | Non-randomized controlled triala | Breast cancer | 69 | Turkey | Military Medical Academy, secondary care |
8 | Williams et al. 2015 [19] | Randomized controlled trial | Pain screening and treatment in head and neck cancer | 156 | UK | Hospital, secondary care |