Simple randomization procedures were followed to randomly assign participants to double-blind treatment with oral gabapentin 900mg, 1800mg or placebo, in a 1:1:1 ratio, using a computer-generated randomization code provided by our laboratory biostatistician. The code was kept by the study pharmacist who provided participants with weekly medication in a blister card package that was consecutively numbered for each participant and prepared according to the randomization schedule. For all groups, each package contained two identical capsules to be taken three times a day. For the gabapentin groups, a placebo capsule was replaced with an identical 300mg capsule of gabapentin on the evening of Day 1, morning of Day 2, afternoon of Day 3 and on a similar schedule each day until the assigned fixed dose of 900mg was achieved on Day 4 or 1800mg was achieved on Day 6 (eTable 1). Participants were maintained on the assigned dose until Week 11, and then were titrated off active medication by substituting one placebo capsule for one capsule of active medication per day, in the reverse order of the initial dose titration, until
