CASP criteria	Met the criteria? (yes, cannot tell, no)
Q1: Did the study address a clearly focused issue?
Q2: Was the sample recruited in an acceptable way?
Q3: Was the outcome accurately measured to minimize bias?
Q4a: Have the authors identified all important confounding factors?
Q4b: Have the authors taken account of confounding factors in their design and analysis?
Q5: Was the follow‐up of subjects complete enough?
Q6: What are the results of this study?
Q7: Do you believe the results?
Q8: Can the results be applied to other populations?
Q9: Do the results of this study fit with other available evidence?
Q10: What are the implications of this study for practice?