Idiopathic and secondary restless legs syndrome during pregnancy in Japan: Prevalence, clinical features and delivery-related outcomes. oleh Chikara Yoshimura, Hisatomi Arima, Hironobu Amagase, Mizuko Takewaka, Kazuko Nakashima, Chikako Imaoka, Nanami Miyanaga, Hirotsugu Obama, Masaki Fujita, Shin-Ichi Ando