1. Sampler S. Tracking protocol complexity. GCPJ. 2000;7(2):6–8.
2. Vogel J, Getz K. Factors driving the increases use of contractors in drug development. Clin Res Reg Affairs. 1997;14(4):177–90.
3. Maloy J, Getz K, Hovde M. Clinical research in transition. Monitor. 2001;15:31–6.
4. Kahn M, Broverman C, Wu N, Farnsworth W, Manlapaz-Espiritu L. Improving protocol quality. Appl Clin Trials. 2002;11:40–50.
5. Rai S. Drug companies cut costs with foreign clinical trials. The New York Times. 2005. http://www.nytimes.com/2005/02/24/business/24clinic.html?8bl.