8Grajewski B, Schnorr TM, Reefhuis J, at al. Work with video display terminals and the risk of reduced birthweight and preterm birth[J]. American Journal Industrial Medicine, 1997, 32(6):681 -688
9Grace P. Y. Szeto, Leon Straker and Sally Raine. A field comparison of neck and shoulder postures in symptomatic and asymptomatic office workers[J]. Applied Ergonomics, 2002,33( 1 ) : 75 - 84