Long-lasting modulation of human motor cortex following prolonged transcutaneous electrical nerve stimulation (TENS) of forearm muscles: evidence of reciprocal inhibition and facilitation - Tinazzi, M; Zarattini, S; Valeriani, M; Romito, S; Farina, S; Moretto, G; Smania, N; Fiaschi, A; Abbruzzese, G (Exp Brain Res, 2005)