Systematic review and meta-analysis of the current evidence on the duration of protection by bacillus Calmette–Guérin vaccination against tuberculosis oleh I Abubakar, L Pimpin, C Ariti, R Beynon, P Mangtani, JAC Sterne, PEM Fine, PG Smith, M Lipman, D Elliman, JM Watson, LN Drumright, PF Whiting, E Vynnycky, LC Rodrigues