“…In previous studies, we have used questionnaires and visual analogue scales to assess patient perceptions of the postoperative period and estimate differences between different surgical modalities (Tonetti et al., , ; Lang et al., ; Tonetti et al., ; Cortellini & Tonetti, ). Similar approaches have been used in recent studies assessing postoperative morbidity of periodontal surgery (Tan, Krishnaswamy, Ong, & Lang, ; Mei, Lee, & Yeh, ). A recent commentary raised awareness of the reliability, validity, sensitivity and clinical relevance issues with the use of current approaches to study postoperative morbidity and recovery in periodontal surgery (McGuire, Scheyer, & Gwaltney, ).…”