Table 3. Results of grading the clinical evidence using the Newcastle-Ottawa Scale from our included studies.

Author last name	Selection	Comparability	Outcome
Alentorn-Geli [9]	****	**	***
Petri [14]	****	**	***
Sheth [15]	***	**	***
Neyton [16]	****	**	**
Hussey [17]	****	**	***
Nolte [18]	****	*	***
Waterman [19]	****	**	***
Pettit [20]	***	**	***
Lindbloom [21]	****	**	**
Wall [22]	****	**	***