“Effect of Low Dose Naltrexone Versus Naproxen Extended-Release for Pain Relief in Knee Osteoarthritis, a Triple-Blinded, Non-Inferiority Phase II Randomized Controlled Trial (FREEDOM) - Study Protocol”. 2021. Principles and Practice of Clinical Research 7 (1). https://doi.org/10.21801/ppcrj.2021.71.3.