Dr. Co-workers and Meric-Bernstam found 41 false or misleading statements on 18 of the Web pages . Web pages containing information on option and complementary medicine were found to be 15.6 times more likely to contain inaccuracies than pages without this type of information. No quality criteria or Site characteristic , or in combination singly, identified inaccurate information reliably. The authors concluded that while most breast cancer info that consumers are more likely to encounter on the web is accurate, commonly cited quality criteria usually do not identify inaccurate information. The accreditation is usually a voluntary review procedure for organizations that provide health information products .Methods Sampling Method The National Tuberculosis Reference Laboratory of the Chinese CDC conducted the study. Cluster-randomized sampling was used to secure a representative sample of patients with tuberculosis in China.2 percent for the 95 percent self-confidence interval and a style aftereffect of 2 . The design impact was set at 2 to account for heterogeneity in level of resistance between clusters.2 percent. Based on the requirements for sample size and the desire to complete the study in 9 months, the decision was made to nationwide select 70 clusters. The number of clusters assigned to each province was proportional to the number of new smear-positive cases reported by that province in accordance with the total number of instances nationwide in 2004 and 2005; in addition, it was identified that all provinces should have at least one cluster.