Databases
PubMed

Cochrane library

EMBase

Web of Science

ScienceDirect

Proquest

Scopus

Google scholar

ClinicalTrials.gov

Clinical Practice Guideline Database
World Health Organization

Guidelines International Network library of guidelines

The National Institute for Health and Care Excellence

Canadian Medical Association CPG Infobase

Scottish Intercollegiate Guidelines Network

Emergency Care Research Institute

Arbeitsgemeinschaft der Wissenschaftlichen Medizinischen Fachgesellschaften

Australian Clinical Practice Guidelines

New Zealand Guidelines Group

National Guideline Clearinghouse