Piper rhythm-like electromyographical activity in muscle stiffness in sodium channel myotonia representing potassium-aggravated myotonia and myotonia permanens.

Masanobu Kinoshita, Tomoya Kubota, Masaomi Yamamoto, Kazuki Shinozawa, Satoru Oji, Hiroaki Fukaura, Kenichi Kaida, Masanori P Takahashi, Kinji Ohno