Referencias
(1) 2021. National Program for Pain Management. [ebook] Directorate-General for Health, Portugal www.dgs.pt. Available at: <https://s3.amazonaws.com/rdcms-iasp/files/production/public/Content/NavigationMenu/Advocacy/InternationalPainSummit/PortugalPainStrategy.pdf> [Accessed 26 July 2021].

(2) Cleveland Clinic. 2021. Acute Pain vs. Chronic Pain: Differences & Causes. [online] Available at: <https://my.clevelandclinic.org/health/articles/12051-acute-vs-chronic-pain> [Accessed 26 July 2021].
(3) 2005 Dr. Jacques Wrobel. Les douleurs induites. Institut UPSA de la douleur. <https://sofia.medicalistes.fr/spip/IMG/pdf/douleurs_induites-2.pdf> [Accessed 26 July 2021].

(4) Merskey, H. and Bogduk, N. (1994) Classification of Chronic Pain. 2nd Edition, IASP Task Force on Taxonomy. IASP Press, Seattle. <http://www.iasp-pain.org/Education/content.aspx?ItemNumber=1698> [Accessed 26 July 2021].

(5) Cigna.com. 2019. How to Overcome Fear of Doctors | Cigna. [online] Available at: <https://www.cigna.com/individuals-families/health-wellness/fear-of-doctors> [Accessed 26 July 2021].