We would like to draw the reader's attention to an error in the following article:The affiliations of the authors were interchanged. The authors' affiliations should be listed as:Yasushi Murakami1, Masahide Oki1, HideoSaka1, Shigehisa Kajikawa2, Ayuka Murakami3 & Akane Ishida11Department of Respiratory Medicine, Nagoya Medical Center, Nagoya, Japan.2Department of Respiratory Medicine, Tokoname Municipal Hospital, Tokoname, Japan.3Department of Neurology, Nagoya Medical Center, Nagoya, Japan.The publisher apologises for this error and any confusion it may have caused.