Treating Lower Phantom Limb Pain in the Postoperative Acute Care Setting Using Virtual Reality: Protocol for a 4-Phase Development and Feasibility Trial - Renée El-Gabalawy; Megan Crooks; Michael Sean Dyck Smith; Elizabeth Hammond; Patrick Gross; Marinya Roznik; David Perrin; Kristin Reynolds; Gabrielle Logan; Lily Pankratz; Hilary Johnson; Linda Girling; et al. (JMIR Research Protocols)