Fries and Krishnan cite a number of sources that presumably attest to the relatively low impact of publication bias; however, our review of these references suggests that, although they are valuable publications that explore the origins of publication bias, they provide no evidence on the supposed small effect of publication bias.
An examination of the state of origin of the publications shows that most studies are from São Paulo and Pernambuco.
The objective of this bibliometric analysis was to examine the geographical origin of biomedical publications in the area of critical care medicine.
Bibliometric data (publication year, origin, journal of publication), data on participants (origin, sample size, gender, age, medical condition) and intervention (yoga tradition, program length, intervention components, control intervention) were extracted by the latter authors (HC,RL), using a standardized data extraction form.
The information extracted was the country of origin, year of publication, population characteristics and the prevalence estimates for headache, migraine, tension-type headache (TTH) and chronic headache, both overall and for each gender, and for various age categories.
The articles were further evaluated for the publishing journal, names of the first and senior author, the institution and department to which the first author was affiliated, the country of origin, year of publication, the radiological investigation(s) being studied, the topic of the article and the number of citations according to Web of Science.
In addition, the following clinical data were extracted for each trial: country of origin, type of publication (article, abstract), proton pump inhibitor used, use of tinidazole (versus other nitroimidazole derivatives), duration of comparative eradication treatment, and adverse event rate.
The aim of our review was to assess the chronologic trend, reasons, research type/design, and country of origin of retracted neurosurgical publications.
The name of the first author, year of publication, origin of the study patients, sample size, and methylation status of the RUNX3 promoter in human gastric cancer and normal or control tissues were extracted.
The following characteristics of the individual eligible research articles were collected: the first author's name, year of publication, origin of population, selection of number of cases, cancer type, and sample source, the member of miR-200 family, validation methods, cut-off values, survival results, and prognosis.
