the number of scientific papers is a conventional metric to measure a country's research performance in a particular area. the aim of this survey was to demonstrate statistical information about orthodontic research published in international and national journals.pubmed as an international and iranmedex and sid as national databases were searched between1997 and 2012. the keyword searching met...

background: the number of scientific publication by a country is an important indication of its science generation and development. the aim of this study was to compare the publications in medical sciences of islamic countries from 2002-2009 with those of a number of developed countries.   methods: the pubmed and cia world fact book were used to extract the number of publications and socioecono...

In their publication of the National Institute for Health and Clinical Excellence (NICE) single technology appraisal of eltrombopag, Boyers et al. [1] report the results of the indirect treatment comparison (ITC) of eltrombopag and romiplostim, conducted by GlaxoSmithKline (GSK) [the manufacturer of eltrombopag] and made available to NICE as part of the single technology appraisal of eltrombopa...

OBJECTIVE To investigate the impact of a higher publishing probability for statistically significant positive outcomes on the false-positive rate in meta-analysis. DESIGN Meta-analyses of different sizes (N=10, N=20, N=50 and N=100), levels of heterogeneity and levels of publication bias were simulated. PRIMARY AND SECONDARY OUTCOME MEASURES The type I error rate for the test of the mean ef...

Unfortunately, original publication of the article has been published with an error in author contribution. The following phrase is added for correction.

In December 1992, the US Environmental Protection Agency (EPA) declared that environmental tobacco smoke is a class A human carcinogen, responsible for approximately 3,000 lung cancer deaths per year in nonsmokers (1). Although evidence is still accumulating on the role of passive smoking in coronary heart disease among nonsmokers (2, 3), if this association is real, then the total burden of de...

error is an inevitable part of life and cannot be completely eliminated, but it can be minimized. a root cause analysis is a technique for understanding the systematic error causes that is involved beyond a person or people to implement an errors and including field and environmental causes of errors when occur in this situation too. an important factor of an error occurrence is a root cause (c...

BACKGROUND Statistical methods for inferring the true magnitude of an effect from a sample should have acceptable error rates when the true effect is trivial (type I rates) or substantial (type II rates). OBJECTIVE The objective of this study was to quantify the error rates, rates of decisive (publishable) outcomes and publication bias of five inferential methods commonly used in sports medic...

CORRECTION In the original publication [1] was an error in the grant number in the funding section. The correct version can be found in this Erratum.

In the original publication [1] the name of author Jeremy M. Aymard was spelled wrong. The original article was updated to rectify this error.