1 Graduate School of Health Management, Keio University, Fujisawa 252-0883, Japan; Department of Community and Global Health, Graduate School of Medicine, University of Tokyo, Tokyo, Japan. Electronic address: mohammed.ba.sarhan@gmail.com.
2 Graduate School of Health Management, Keio University, Fujisawa 252-0883, Japan; Faculty of Nursing and Medical Care, Keio University, Fujisawa 252-0883, Japan; Department of Community and Global Health, Graduate School of Medicine, University of Tokyo, Tokyo, Japan.
3 Institute of Community and Public Health, Birzeit University, Birzeit, Palestine.
4 Department of Community and Global Health, Graduate School of Medicine, University of Tokyo, Tokyo, Japan.