Table 2.

Characteristics of included studies

Study	Type	Setting	Patients, n	Mean age, years	Mean follow-up, years
de Albornoz et al34	RCT	University	26	51.7	1
Bae et al35	Prospective	University	19	47	1
Cabello et al36	Prospective	Private	14	52	1
Canullo and Götz37	Prospective	NR	5	49.1	1.5
Canullo38	Prospective	Private	25	52.28	3.3
Cionca et al39	Prospective	University	32	51.9	1.6
Cooper et al40	Prospective	University	41	30.6	3
Cosyn et al41	Prospective	University	25	54	3
den Hartog et al42	RCT	University	62	39.3	1.5
Ekfeldt et al43	Retrospective	Private	130	23	NR
Furze et al44	Prospective	Private	10	45.1	1
Galluci et al45	RCT	University	20	NR	2
Gotfredsen46	Prospective	University	20	33	10
Guljé et al47	Prospective	Multicenter	21	57	1
Hosseini et al48	RCT	University	36	28.1	1
Hosseini et al49	Prospective	University	59	27.9	3
Jemt50	Retrospective	University	35	33.5	10
Kim et al51	Prospective	University	213	56.5	3.6
Lee and Hasegawa52	Prospective	NR	9	42	1
Lops et al53	Prospective	University	81	54	5
Lops et al54	Prospective	University	72	46	2
MacDonald et al55	Prospective	University	20	43.5	NR
Nejatidanesh et al56	Retrospective	University	122	50	4.9
Nothdurft and Pospiech57	Prospective	University	24	NR	1
Passos et al58	Retrospective	University	141	NR	NR
Payer et al59	RCT	University	30	NR	2
Pozzi et al60	Prospective	University	27	54.18	3.6
Vanlıoglu et al61	Prospective	University	12	33.2	5
Vigolo et al62	RCT	University	20	NR	4
Vigolo and Givani63	Prospective	Private	144	37	5
Zembic et al64	RCT	University	18	41.6	5.6
Zembic et al65	Prospective	University	16	46	11.3

Abbreviations: RCT, randomized controlled trial; NR, not reported.