Table 1.

Laser candidates and methodology by Center

Parameter	Center 1	Center 2	Center 3
Candidate stages for laser	I – IV	II – IV	I – IV
Cannula size used
9F			√
10F	√	√	√
12F	√		√
Entry method
Direct	√		√
Seldinger	√	√
Solomon technique	√		√
Collagen plug placement	√