Sana Akram, Muhammad Zeeshan, Mariyam Masood, Daud Anthoney, Nadia Irshad, Mahrukh Anwar, “The Impact of Orthodontic fixed appliance and clear plastic aligner in periodontal health; A comparative clinical study”, Pakistan Journal of Medical & Health Sciences, vol. 16, no. 04, p. 305, May 2022.