Table 2.

Excluded studies for qualitative and quantitative synthesis with reasons.

Stage	Reason for Exclusion	Articles
Qualitative synthesis	No control group	Ozturan et al. [44]; Eeckhout et al. [45]; Ghanaati et al. [46]
	No valid outcome for this SR	Zafiropoulos et al. [47]; McGuire y Secheyer [48]; Tonetti et al. [5]; Zuiderveld et al. [30]
	Use of the same data of a previous study	Puzio et al. [13]
Quantitative synthesis	Increase the follow-up of a previous study and the follow-up period not considered for meta-analysis	Thoma et al. [43]