Doubt looms over hydroxychloroquine study that halted global trials Ars TechnicaTop journals raise concerns about data in two studies related to Covid-19 STATA mysterious company's coronavirus papers in top medical journals may be unraveling Science MagazineHydroxychloroquine study questioned as journal issues 'expression of concern' about research NBC NewsMedical journal says concerns raised over massive hydroxychloroquine study | TheHill The HillView Full Coverage on Google News