BACKGROUND Mental contrasting is a self-regulation strategy that is required for strong goal commitment. In mental contrasting, individuals firstly imagine a desired future or health goal that contrasted with the reality proceeding the goal state, which after reflection is viewed as an obstacle (Oettingen et al. J Pers Soc Psychol 80:736-753, 2001). Mentally contrasting a positive future with r...

OBJECTIVE A quantitative synthesis of evidence via standard pair-wise meta-analysis lies on the top of the hierarchy for evaluating the relative effectiveness or safety between two interventions. In most healthcare problems, however, there is a plethora of competing interventions. Network meta-analysis allows to rank competing interventions and evaluate their relative effectiveness even if they...

BACKGROUND Meta-ethnography is a unique, systematic, qualitative synthesis approach widely used to provide robust evidence on patient and clinician beliefs and experiences and understandings of complex social phenomena. It can make important theoretical and conceptual contributions to health care policy and practice. RESULTS Since beliefs, experiences, health care contexts and social phenomen...

Meta-analysis offers ecologists a powerful tool for knowledge synthesis. Albeit a form of review, it also shares many similarities with primary empirical research. Consequently, critical reading of meta-analyses incorporates criteria from both sets of approaches particularly because ecology is a discipline that embraces heterogeneity and broad methodologies. The most important issues in critica...

Variable study quality is a challenge for all the empirical sciences, but perhaps particularly disciplines such as ecology where experimentation frequently hampered by system complexity, scale and resourcing. The resulting heterogeneity, necessity of subsequently combining results different designs, fundamental issue evidence synthesis. We welcome recognition this Christie et al. (2019) their a...