Definitions and guidelines for research on antibiotic persistence - Balaban, NQ; Helaine, S; Lewis, K; Ackermann, M; Aldridge, B; Andersson, DI; Brynildsen, MP; Bumann, D; Camilli, A; Collins, JJ; Dehio, C; Fortune, S; et al. (Nature Reviews Microbiology, 2019)