00331nas a2200133   4500000000100000008004100001100001000042700001400052700001200066700001600078245008700094300000900181490000700190       2003                            d1 aLo S.1 aCheing G.1 aTsui A.1 aHui-Chan C.00aOptimal stimulation duration of tens in the management of osteoarthritic knee pain  a62-80 v35