1 Department of Medical Laboratory Science, Faculty of Health Sciences, Hokkaido University, Sapporo, Japan; Diagnostic Center for Sonography, Hokkaido University Hospital, Sapporo, Japan.
2 Diagnostic Center for Sonography, Hokkaido University Hospital, Sapporo, Japan.
3 Japan Community Healthcare Organization, Hokkaido Hospital, Sapporo, Japan.
4 Department of Clinical Laboratory Sciences, Faculty of Health Sciences, Japan Healthcare University, Sapporo, Japan.
5 Department of Cardiovascular Medicine, Faculty of Medicine and Graduate School of Medicine, Hokkaido University, Sapporo, Japan.
6 Diagnostic Center for Sonography, Hokkaido University Hospital, Sapporo, Japan; Division of Cardiology, Teine Keijinkai Hospital, Sapporo, Japan.