. 2019 Jan 28;19:12. doi: 10.1186/s12893-019-0476-x

Table 1.

Scale assessment of the quality of the studies

Author	Year	Location	Study	Group	Cases	Gender		Age	Follow-up time (month)	Newcastle – Ottawa scale Selection/comparability/Exposure = total score
Author	Year	Location	Study	Group	Cases	Male	Female	Age	Follow-up time (month)
PAUL TROTTMA [11].	2014	America	Retrospective	RAMPS	6	NA	NA	NA	NA	3/1/2 = 6
PAUL TROTTMA [11].	2014	America	Retrospective	DP	20	NA	NA	NA	NA	3/1/2 = 6
Toshiya Abe [12]	2016	Japan	Retrospective	RAMPS	53	31	22	68.6 ± 10.7	267.3 ± 11.5	4/2/2 = 8
Toshiya Abe [12]	2016	Japan	Retrospective	DP	40	29	11	65.2 ± 8.6	339.4 ± 13.2	4/2/2 = 8
Eun Young Kim [13]	2017	Korea	Retrospective	RAMPS	30	13	17	63.7 ± 8.2	33(8–97)	4/1/2 = 7
Eun Young Kim [13]	2017	Korea	Retrospective	DP	19	7	12	62.1 ± 8.5	33(8–97)	4/1/2 = 7
Hyo Jun Park [14]	2014	Korea	Retrospective	RAMPS	38	23	15	62.17 (40–75)	18.2 (3.0–82.1)	4/2/3 = 9
Hyo Jun Park [14]	2014	Korea	Retrospective	DP	54	35	19	61.25 (37–79)	15.7 (4.4–148.5)	4/2/3 = 9
MARCO LATORRE [15]	2013	Italy	Retrospective	RAMPS	8	5	3	61	NA	4/1/2 = 7
MARCO LATORRE [15]	2013	Italy	Retrospective	DP	17	11	6	60	NA	4/1/2 = 7