T Olds, S Blunden, J Petkov, F Forchino - Sleep Medicine Reviews, 2010 - cir.nii.ac.jp
The relationships between sex, age, geography and time in bed in adolescents: A meta-analysis
of data from 23 countries | CiNii Research CiNii 国立情報学研究所 学術情報ナビゲータ[サイニィ …