5Van den Beuken-van Everdingen MH,de Rijke JM,Kessels AG,et al. Prevalence of pain in patients with cancer:a systematicreview of the past 40 years[J].Ann Oncol,2007,18(9) : 1437-1449.
6Hertzog MA. Considerations in determining sample size for pi-lot studies [J]. Res Nurs Health, 2008,31 (2) : 180-191.
7Morisky DE,Ang A,Krousel-Wood M,et al. Predictive validityof a medication adherence measure in an outpatient setting[J].J Clin Hypertens ,2008,10(5) :348-354.
8Deandrea S,Montanari M,Moja L,et al. Prevalence of under-treatment in cancer pain :a review of published literature [J].Ann Oncol. 2008,19( 12) : 1985-1991.
9Aqboola S,Kamdar M,Flanaqan C,et al. Pain management incancer patients using a mobile app: study design of a ran-domized controlled trial[J].JMIR Res Protoc.2014,3(4) :e76.
10World Health Organization. Cancer Pain Relief [ M ]. Geneva ,Switzerland : World Health Organization, 1986.