Ishikawa T., Yasumura Y., Sakai A., Ohtsuru A., Miyazaki M., Hosoya M., Ohira T., Kamiya K.,Experience in individual dose estimation after the Fukushima nuclear accident using self-administered questionnaires -activities to encourage responses to the questionnaires and resulting response rate-.Radiation Environment and Medicine  8 (2) 118 – 126,   (2019).