Intravesical Bacillus Calmette-Guérin with interferon-alpha versus intravesical Bacillus Calmette-Guérin for treating non-muscle-invasive bladder cancerAndrew RH Shepherd, Emily Shepherd, and Nicholas R BrookPublished online: 8 March 2017DOI: 10.1002/14651858.CD012112.pub2