Limitations
This systematic review has several limitations. Guidelines in other languages besides English were not included. Moreover, only guidelines available in public digital databases have been included. Thus, we could have missed guidelines that may have been published in different forms, such as conference reports, PhD thesis and books. The AGREE-II tool used for the appraisal of the guidelines also has several shortcomings, including the lack of standardization for the scoring method, and also the absence of criteria to distinguish between high and low quality evidence provided in a guideline22. The lack of standardization in the scoring system may amplify researcher bias. The team acknowledges domains on ‘rigor of development’ and ‘clarity of presentation’ played a more significant role in influencing the overall score of the guidelines, although the appraisal tool indicated that all domains play an equal role in appraising a guideline22.