Dr Spiegel from Boston has a developed a more advanced method to the common Wolford procedure. He also published a paper on this technique in 2008.
The technique appears to be safer than the Wolford method because he uses a flexible endoscope to locate the vocal cords. Through this the surgeon would know their exact position, making it easier to shave everything which can be removed safely.
If you're interested, I can share the two papers (Spiegel, 2008 and Wolford, 1992) with you. Just give me a shout.