Figure 4.

Heat map contrasting interventions used with the type of pain expected to be elicited. Colouration/number in box represents number of studies. Whilst some studies could arguably have been included in multiple categories to simplify reporting, one category has been assigned. ^ǂ Pain in this study, Mittal et al., 2016 [59], was assigned as acute since it was induced by cold stress, although sickle cell pain can be neuropathic in origin. * Model of Hsi et al., 2020 [45], did not relate to a neuropathy.