Strengths and limitations
The strengths of this systematic review include its comprehensive search
strategy and design ensuring the study selection, data extraction, and
methodological and reporting quality assessment were conducted
independently by two authors. It is limited however by restricting the
search strategy to two databases. We contacted all registered study
authors and found no additional publications. There are no established
criteria to assess the usability of completed outcome sets. No decisions
about the usability, feasibility, and applicability can therefore be
made.