Of the potentially eligible 48 citations, 29 were based on personal opinion or review and encompassed a wide range of topics where the term "patient-centred" had been applied.
The data were compared with data published by the Oak Ridge Institute for Science and Education (ORISE) in 1995 (no detailed citation information available) which were based on a simple three-compartment model in which all activity not measured in the blood or excreted via the breath was assumed to reside in the heart [ 15].
Finally, listing citations of peer-reviewed publications that were based on the dataset validates it and serves as a dynamic guide about its data quality.
Scientists all over the world tend to publish in English, and because QS's citations indicator is based on Elsevier's Scopus database, which has a bias towards English-language publications, this gives an advantage to institutions focused on science – academics in the humanities often prefer to publish in their own language.
Moreover, co-citation analyses are based on the premise that if a given pair of works is co-cited it is because they share some content, or intellectual, similarity (White and Griffith 1981; White and McCain 1998; Ponzi 2002; Ferreira et al. 2014).
Citation selection was based on: (1) elderly cancer patients as the study population; (2) disease management and (3) case studies, intervention studies, assessments, evaluations and studies.
The first phase, citation selection, was based on: (1) elderly cancer patients as the study population; (2) disease management as an intervention and (3) case studies, intervention studies, assessments and evaluation studies as study characteristics.
Of the 200 papers published each year that receive the most citations, about 10% are based on Hubble data.
In particular, the Thomson Scientific Journal Impact Factor JIFF) [1] which is published yearly as part of the Journal Citation Reports (JCR) is based on this very principle; it is calculated by dividing the total number of citations that a journal receives over a period of 2 years by the number of articles it published in that same period.
Rankings are based on citations of work coming from each university's department.
