1. Division of Bio-Environmental Adaptation Sciences, Graduate School of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan.
2. Department of Cardiovascular Surgery, Hiroshima University Hospital, Hiroshima, Japan.
3. Space Bio-Laboratories Co., Ltd., Hiroshima, Japan.
4. Department of Neurosurgery, Graduate School of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan.