Safety and efficacy of repeated injections of botulinum toxin A in peripheral neuropathic pain (BOTNEP): a randomised, double-blind, placebo-controlled trial - Attal, Nadine; Andrade, Daniel C. de; Adam, Frédéric; Ranoux, Danièle; Teixeira, Manoel J.; Galhardoni, Ricardo; Raicher, Irina; Üçeyler, Nurcan; Sommer, Claudia; Bouhassira, Didier (Lancet Neurology, 2016)