7Kameyama O, Shibano K, Kawakita H, et al. Medical check of competitive canoeists [J]. J Orthop Sci, 1999,4 ( 4 ) : 243-249.
8Hofmann F, Stossel U, Michaelis M, et al. Low back pain and lumbago-sciatica in nurses and a reference group of clerks: results of a comparative prevalence study in Germany[J]. Int Arch Occup Environ Heajth ,2002, 75 (7) : 484-490.
9Kameyama O, Shibano K, Kawakita H, et al. Medical check of competitive canoeists[ J]. J Orthop Sci, 1999,4 ( 4 ) : 243-249.
10Hofmann F, Stossel U, Mi.ehaelis M, et al. Low back pain and lumbago-sciatica in nurses and a reference group of clerks: results of a comparative prevalence study in Germany [ J ]. Int Arch Occup Environ Health, 2002,75 ( 7 ) :484-490.
