[1
]MANILA Consulting Group, Inc.; 1420 Beverly Road Suite 220 McLean VA USA 22101
[2
]ECRI Institute; 5200 Butler Pike Plymouth Meeting PA USA 19462
[3
]Manila Consulting Group; 1420 Beverly Road Suite 220 McLean Virginia USA 22101
[4
]University of Oxford; Pain Research and Nuffield Department of Clinical Neurosciences
(Nuffield Division of Anaesthetics); Pain Research Unit Churchill Hospital Oxford
Oxfordshire UK OX3 7LE
[5
]Oregon Health & Science University; Department of Medical Informatics and Clinical
Epidemiology; 3181 SW Sam Jackson Park Rd. Mail Code: BICC Portland Oregon USA 97239