[1] Hosp Prof Doutor Fernando Fonseca, Dept Phys Med & Rehabil, IC-19 IC19 276, P-2720276 Amadora, Portugal
[2] Mayo Clin, Dept Pain Med, Jacksonville, FL USA
[3] Mayo Clin, Dept Anesthesiol, Jacksonville, FL USA
[4] Mem Sloan Kettering Canc Ctr, Dept Anesthesiol & Crit Care, New York, NY USA
[5] Dept Surg, Mayo Clin, Jacksonville, FL USA
[6] Dept Phys Med & Rehabil, Mayo Clin, Jacksonville, FL USA