https://www.mayoclinic.org/diseases-conditions/narcissistic-personality-disorder/symptoms-causes/syc-20366662https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5783345/#:~:text=Empirical%20evidence%20for%20the%20narcissism,1992%20in%20adolescents%20%5B2%5D..