Nationwide survey of patients with multisystem proteinopathy in Japan oleh Satoshi Yamashita, Yuji Takahashi, Jun Hashimoto, Ayuka Murakami, Ryoichi Nakamura, Masahisa Katsuno, Rumiko Izumi, Naoki Suzuki, Hitoshi Warita, Masashi Aoki, the Japan MSP Study Group