1. WHO (World Health Organization). WHO handbook for guideline development. 2nd ed. 2014. https://apps.who.int/medicinedocs/documents/s22083en/s22083en.pdf. Accessed 30 Sept 2019.
2. IOM (Institute of Medicine). Clinical practice guidelines we can trust. Washington, DC: The National Academies Press; 2011. http://data.care-statement.org/wp-content/uploads/2016/12/IOMGuidelines-2013-1.pdf. Accessed 30 Sept 2019.
3. AHRQ (Agency for Healthcare Research and Quality). NGC and NQMC inclusion criteria. 2014. https://www.ahrq.gov/gam/summaries/inclusion-criteria/index.html#ast. Accessed 30 Sept 2019.
4. NICE (National Institute for Health and Care Excellence). Developing NICE guidelines: the manual. 2014. https://www.nice.org.uk/media/default/about/what-we-do/our-programmes/developing-nice-guidelines-the-manual.pdf. Accessed 30 Sept 2019.
5. European Observatory on Health Systems and Policies. Improving healthcare quality in Europe. Characteristics, effectiveness and implementation of different strategies. Health Policy Series N° 53. 2019.