6DeWal H, Su E, DiCesare PE. Instability following total hip ar- throplasty [ J ]. American journal of orthopedics, 2003,32 ( 8 ) :377 - 382.
7Van Cleve L, Bossert EA, Savedra MC. Cancer pain in children: The selection of a model to guide research [ J ]. Journal for special- ists in pediatric nursing : JSPN, 2002,7(4) :163 -165.
8Merboth MK, Barnason S. Managing pain: The fifth vital sign [J]. The Nursing clinics of North America, 2000,35 (2) :375 - 383.