ALHarthi, S. S., Divakar, D. D., Alwahibi, A., & BinShabaib, M. S. (2022). Effect of mechanical instrumentation with adjunct photodynamic therapy on salivary TNFα levels and clinical periodontal and peri-implant status in patients with depression: A randomized controlled trial. Photodiagnosis and photodynamic therapy, 40, 103042. doi: 10.1016/j.pdpdt.2022.103042. Here, TNF is linked to depressive disorder.