Author and Date	Clearly state aim	Inclusion of consecutive patients	Prospective data collection	Unbiased endpoint assessment	Follow-up appropriate	Loss to f/u < 5%	Prospective calculation of sample size
Audernaert [39]	2	2	2	2	2	2	0
Badhe [40]	2	2	2	2	2	2	0
Bond [41]	2	2	2	2	2	2	0
Dukan [42]	2	2	2	2	2	1	0
Gupta [43]	1	2	2	2	2	2	0
Gupta [44]	2	2	2	2	2	2	0
Kim [45]	2	2	2	2	2	2	0
Kokkalis [46]	1	2	1	2	2	2	0
Modi [47]	2	2	2	2	2	2	0
Mori [31]	2	2	2	2	2	2	0
Nada [48]	1	0	2	2	2	2	0
Pandey [33]	2	2	2	2	2	2	0
Petrie [49]	2	2	2	2	2	1	0
Rhee [50]	2	1	2	2	2	1	0
Rhee [51]	1	2	2	2	2	2	0
Sano [52]	2	1	0	2	2	2	0
Varvitsiotis [53]	2	2	2	2	2	2	0
Wong [54]	1	2	2	2	2	2	0