Diagnostic accuracy of Gram staining when predicting staphylococcal hospital-acquired pneumonia and ventilator-associated pneumonia: a systematic review and meta-analysisRanzani OT, Motos A, Chiurazzi C, Ceccato A, Rinaudo M, Li Bassi G, Ferrer M, Torres ANov 1, 2020Ranzani OTGroup LeaderI am an epidemiologist.