* M Simão de Aquino, A Haddad, L Masako Ferreira. Assessment of quality of life in patients who underwent minimally invasive cosmetic procedures. Aesthetic Plast Surg. 2013;37:497-503.
* A Yaworsky, S Daniels, S Tully, F Beddingfield 3rd. The impact of upper facial lines and psychological impact of crow's feet lines: content validation of the Facial Line Outcomes (FLO-11) Questionnaire. J Cosmet Dermatol. 2014;13:297-306.
* B Fink, M Prager. The effect of incobotulinumtoxin a and dermal filler treatment on perception of age, health, and attractiveness of female faces. J Clin Aesthet Dermatol. 2014;7:36-40.
* T Petrie, F Moore. Facial treatment with botulinum toxin improves attractiveness rated by self and others, and psychological wellbeing. Dermatol Surg. 2017;43:322-8.
* S Fagien, JDA Carruthers. A comprehensive review of patient-reported satisfaction with botulinum toxin type A for aesthetic procedures. Plast Reconstr Surg. 2008;122:1915-25.