The Analgesic and Side Effects of Tramadol Hydrochloride Immediate-Release and Extended-Release Tablets in Patients With Chronic Low Back Pain. - Inage K; Sainoh T; Okuyama K; Yamashita M; Ohyama S; Fujimoto K; Chikubu H; Abe K; Ohtori S; Orita S (Cureus, 2024)