Effectiveness of lumbar stabilization exercise with real-time ultrasound imaging biofeedback on lumbar multifidus muscle cross-sectional area in individuals with non-specific chronic low back pain: a study protocol for a randomized controlled trial. - Sarafadeen R; Ganiyu SO; Ibrahim AA; Ismail A; Akindele MO; Kaka B; Awotidebe AW (Trials, 2022)