Rifampicin chemoprophylaxis in preventing leprosy in contacts of patients with leprosy: a comprehensive systematic review protocol - Ferreira, Silvana Benevides; Yonekura, Tatiana; Takahashi, Juliana Akie; Ignotti, Eliane; Cortela, Denise da Costa Boamorte; Soares, Cassia Baldini (JBI database of systematic reviews and implementation reports, 2015)