Study Quality Assessment
The level of evidence for each study was determined in accordance with the guidelines outlined by the Center for Evidence-Based Medicine (http://www.cebm.net/index). Non-randomized article quality was assessed with The National Institute for Health and Clinical Excellence (NICE) criteria: ≤ 2 metrics met (“Yes”) was considered poor quality, 3 – 5 was fair quality, ≥ 6 considered good quality.