A comparison of botulinum toxin A and intralesional steroids for the treatment of plantar fasciitis: a randomized, double-blinded study - Elizondo Rodríguez, Jorge Alberto; Araujo Lopez, Yariel; Moreno González, J. Alberto; Cárdenas Estrada, Eloy; Mendoza Lemus, Oscar Fernando; Acosta Olivo, Carlos Alberto (Williams & Wilkins, 2013)