[1] Oregon Hlth & Sci Univ, Dept Neurol Surg, Portland, OR USA
[2] Oregon Hlth & Sci Univ, Dept Anesthesiol Perioperat Med, Portland, OR USA
[3] Univ Groningen, NL-9700 AB Groningen, Netherlands
[4] E Tennessee State Univ, Johnson City, TN 37614 USA
[5] Univ Oklahoma, Dept Physiol, Norman, OK 73019 USA
[6] Natl Pain Fdn, Board Clin Directors, Denver, CO USA
[7] Medtronic, Neurol, Minneapolis, MN 55432 USA
[8] Univ Washington, Dept Neurol Surg, Seattle, WA 98195 USA
[9] Texas Tech Univ, Dept Anesthesia, Lubbock, TX 79409 USA
[10] Nevada Neurosci Inst, Las Vegas, NV USA