H. Ksinopoulou, C. Hatzoglou, Z. Daniil, K. Gourgoulianis, and H. Karetsi, “Respiratory function in vocal soloists, opera singers and wind instrument musicians”, Med Lav, vol. 107, no. 6, pp. 437–443, Dec. 2016, doi: 10.23749/mdl.v107i6.5454.