Combined use of a broad-panel respiratory multiplex PCR and procalcitonin to reduce duration of antibiotics exposure in patients with severe community-acquired pneumonia (MULTI-CAP): a multicentre, parallel-group, open-label, individual randomised trial conducted in French intensive care units - Voiriot, G; Fartoukh, M; Durand-Zaleski, I; MULTI-CAP study group (BMJ Open, 2021)