An Epidemiological Study of Insomnia Among the Japanese General PopulationKyuja Kim, Ryuji Ogihara, Xianchen Liu et al.|SLEEP|2000Cited by 523
Sleep loss and daytime sleepiness in the general adult population of JapanXianchen Liu, Ryuji Ogihara, Masako Okawa et al.|Psychiatry Research|2000Cited by 279
Prevalence and Correlates of Self-Reported Sleep Problems Among Chinese AdolescentsXianchen Liu, Hiroshi Kurita, Makoto Uchiyama et al.|SLEEP|2000Cited by 220
Life events, locus of control, and behavioral problems among Chinese adolescentsXianchen Liu, Dengdai Ma, Lianqi Liu et al.|Journal of Clinical Psychology|2000Cited by 152