1 College of Nursing, Aichi Medical University, Nagakute, Japan. Electronic address: amachi@kej.biglobe.ne.jp.
2 Institute for Occupational Health Science, Aichi Medical University, Nagakute, Japan.
3 Department of Dermatology, Aichi Medical University, Nagakute, Japan.
4 Department of Dental Hygiene, Junior College, Aichi Gakuin University, Nagoya, Japan.
5 College of Nursing, Aichi Medical University, Nagakute, Japan.
6 Division of Biostatistics, Clinical Research Center, Aichi Medical University Hospital, Nagakute, Japan.
7 Institute for Occupational Health Science, Aichi Medical University, Nagakute, Japan; Department of Health and Psychosocial Medicine, Aichi Medical University School of Medicine, Nagakute, Japan.