Is mechanical pain threshold after transcutaneous electrical nerve stimulation (TENS) increased locally and unilaterally? A randomized placebocontrolled trial in healthy subjects - Aarskog, Reidar; Johnson, Mark I.; Demmink, Jan Hendrik; Lofthus, Anne; Iversen, Vegard; Lopes-Martins, Rodrigo Alvaro Brandão; Joensen, Jon; Bjordal, Jan M. (Physiotherapy Research International, 2007)