Impact of shift starting time on sleep duration, sleep quality, and alertness prior to injury in the People's Republic of China
David A. Lombardi, PhD1, Kezhi Jin, PhD, Celine Vetter, PhD, Theodore K. Courtney, MS, CSP1, Simon Folkard, D.Sc, Anna Arlinghaus, PhD, Youxin Liang, MD, PhD and Melissa J. Perry, ScD3
(1)Liberty Mutual Research Institute for Safety, Hopkinton, MA, (2)The George Washington University, Washington DC, DC