Correction: HELLO: a protocol for a cluster randomized controlled trial to enhance interpersonal relationships and team cohesion among ICU healthcare professionals - Elie Azoulay; Nancy Kentish Barnes; Sheila Nainan Myatra; Maria-Cruz Martin Delgado; Yaseen Arabi; Carole Boulanger; Giovanni Mistraletti; Maria Theodorakopoulou; Vernon Van Heerden; José-Artur Paiva; Oktay Demirkýran; Gabriel Heras La Calle; et al. (Intensive Care Medicine Experimental)