[1
]
Department of Women's Health Medicine, Hokkaido University Graduate School of Medicine,
Kita Ku, Sapporo, 060-8638, Japan. Electronic address: sjbh1810@med.hokudai.ac.jp.
[2
]
Department of Health Science, Asahikawa Medical University, Asahikawa, Japan.
[3
]
Faculty of Nursing, Japanese Red Cross Hokkaido College of Nursing, Kitami, Japan.
[4
]
Hokkaido University Centre for Environmental and Health Sciences, Sapporo, Japan.