Study selection
Two independent researchers (OACI and MPS) analyzed the articles. First,
they read the abstracts and exclude those not fulfilling inclusion
criteria. After that, both authors analyzed the full-text and, again,
decided whether they should be included or excluded. A third
investigator (ALP) acted as a mediator in case of dispute. Agreement was
calculated using Cohen’s kappa coefficient, with a k value of 0.92.