C. Berthin and H. Maillard, “Duration of Efficacy Increases with the Repetition of Botulinum Toxin A Injections in Primary Axillary Hyperhidrosis: A 15-year Study in 117 Patients”, Acta Derm Venereol, vol. 99, no. 13, pp. 1237–1240, Oct. 2019.