• 1
    Willard MD, Lovering SL, Cohen ND, Weeks BR. Quality of tissue specimens obtained endoscopically from the duodenum of dogs and cats. J Am Vet Med Assoc 2001;219:474479.
  • 2
    Day MJ, Bilzer T, Mansell J, et al. Histopathological standards for the diagnosis of gastrointestinal inflammation in endoscopic biopsies from the dog and cat: A report from the World Small Animal Veterinary Association Gastrointestinal Standardization Group. J Comp Pathol 2008;137:S1S43.
  • 3
    Campbell MK, Mollison J, Grimshaw JM. Cluster trials in implementation research: Estimation of intracluster correlation coefficients and sample size. Stat Med 2001;20:391399.
  • 4
    Ukoumunne OC. A comparison of confidence interval methods for the intraclass correlation coefficient in cluster randomized trials. Stat Med 2002;21:37573774.
  • 5
    Killip S, Mahfoud Z, Pearce K. What is an intracluster correlation coefficient? Crucial concepts for primary care researchers. Ann Fam Med 2005;2:204208.
  • 6
    Scheaffer RL, Mendenhall W, Ott RL. Elementary Survey Sampling, 5th ed. Belmont, CA: Wadsworth Publishing Company; 1996:294.
  • 7
    Fleiss JL, Levin BA, Paik MC. Statistical Methods for Rates and Proportions, 3rd ed. Hoboken, NJ: J. Wiley; 2003:445.
  • 8
    Dohoo I, Martin W, Stryhn H. Veterinary Epidemiologic Research. Charlottetown, Prince Edward Island, Canada: AVC Inc.; 2003:48.
  • 9
    Willard MD, Jergens AE, Duncan RB, et al. Interobserver variation among histopathologic evaluations of intestinal tissues from dogs and cats. J Am Vet Med Assoc 2002;220:11771182.
  • 10
    Penninck DG, Nyland TG, Fisher PE, et al. Ultrasonography of the normal canine gastrointestinal tract. Vet Radiol 1989;30:272276.
  • 11
    Googin JM, Biller DS, Debey BM, et al. Ultrasonographic measurement of gastrointestinal wall thickness and the ultrasonographic appearance of the ileocolic region in healthy cats. J Am Anim Hosp Assoc 2000;36:224228.
  • 12
    Mansell J, Willard MD. Biopsy of the gastrointestinal tract. Vet Clin N Am 2003;33:10991166.
  • 13
    Jergens AE, Moore FM. Endoscopic biopsy specimen collection and histopathologic considerations. In: TamsT, ed. Small Animal Endoscopy, 2nd ed. Philadelphia, PA: Mosby Yearbook; 1999:323340.