8c7a652a___NEL__5
[0] Quality Scientific rigor and validity Study design and execution [1] Studies of strong design Free from design flaws, bias, and execution problems [2] Studies of strong design with minor methodological concerns OR only studies of weaker study design for question [3] Studies of weak design for answering the question OR inconclusive findings due to design flaws, bias, or execution problems [4] No studies available Conclusion based on usual practice, expert consensus, clinical experience, opinion, or extrapolation from basic research [5] 
No evidence that pertains to question being addressed
- NEL
5