Correspondence on BIP test.
Singh
Vijah
V
Whitworth
Michael  L
M
Ramamurthy
Somayaji
S
D004824:Epidural Space / Q000000981:diagnostic imaging / Q000601:surgery*; D005471:Fluoroscopy / Q000379:methods*; D006801:Humans; D007268:Injections, Epidural / Q000379:methods; D009339:Needles / Q000592:standards; D009407:Nerve Block / Q000379:methods*; D011312:Pressure