Mahévas, M., Tran, V., Roumier, M., Chabrol, A., Paule, R., Guillaud, C., Fois, E., Lepeule, R., Szwebel, T., Lescure, F., Schlemmer, F., Matignon, M., Khellaf, M., Crickx, E., Terrier, B., Morbieu, C., Legendre, P., Dang, J., Schoindre, Y., Pawlotsky, J., Michel, M., Perrodeau, E., Carlier, N., Roche, N., de Lastours, V., Ourghanlian, C., Kerneis, S., Ménager, P., Mouthon, L., Audureau, E., Ravaud, P., Godeau, B., Gallien, S., & Costedoat-Chalumeau, N. (2020). clinical efficacy of hydroxychloroquine in patients with covid-19 pneumonia who require oxygen: observational comparative study using routine care data. BMJ, 369, . http://access.bl.uk/ark:/81055/vdc_100130159748.0x00002b