Gap analysis, scoping, and shortlist for alternative instruments.

Elements with at least 1 interpretable instrument (see Phase 2.1) are shaded. Targeted searches of MEDLINE were performed for the remaining elements (i.e., “gaps,” unshaded, see Phase 2.2). For gaps within the domain of pain (hashed), the resources aggregated by IMMPACT were deemed sufficient [48]. The number of articles (N) screened is indicated for each gap. Notably, only 1 suitable resource was identified for “fatigue.”