Prevalence of Insomnia Among Residents of Tokyo and Osaka After the Great East Japan Earthquake: A Prospective Study

Hiroaki Sugiura   ^{1 *} , MD, PhD ;   Manabu Akahane   ^{1 *} , MD, PhD ;   Yasushi Ohkusa   ^{2 *} , PhD ;   Nobuhiko Okabe   ^{2 *} , MD, PhD ;   Tomomi Sano   ^{1 *} , MD, PhD ;   Noriko Jojima   ^{3 *} , MSN ;   Harumi Bando   ^{3 *} , MS ;   Tomoaki Imamura   ^{1 *} , MD, PhD

¹ Health Management and Policy, Department of Public Health, Nara Medical University School of Medicine, Kashihara, Japan

² National Institute of Infectious Diseases, Infectious Disease Surveillance Center, Tokyo, Japan

³ Faculty of Nursing, Nara Medical University School of Medicine, Kashihara, Japan

*all authors contributed equally