2022. Journal of Pharmaceutical Negative Results ¦ Volume 13 ¦ Special Issue 6 ¦ 2022 1104 Affordability of orthodontic treatment: a step towards the economic evaluation. Journal of Pharmaceutical Negative Results. (Oct. 2022), 1104–1109. DOI:https://doi.org/10.47750/pnr.2022.13.S06.148.