Search strategy
The following databases will be searched:
- Cochrane CENTRAL (Trials)
- MEDLINE (OVID)
- Embase (OVID)
These databases will be searched for entries between the period of
1st October 2012 to the 31st May
2021. This aligns with the end date of the search entries used in a
previous systematic review on the same subject11.
Studies which were published earlier and included in the previous
systematic review will be evaluated for inclusion in the current
systematic review.
Forward and backward citation analysis will be used in all included
studies to pinpoint other relevant studies. Any additional studies
discovered by the review team who are experts in the field may be
included. Only published, peer-reviewed full reports will be included.