Study protocol for statin web-based investigation of side effects (StatinWISE): a series of randomised controlled N-of-1 trials comparing atorvastatin and placebo in UK primary car... by Herrett, E, Williamson, E, Beaumont, D, Prowse, D, Youssouf, N, Brack, K, Armitage, J, Goldacre, B, MacDonald, T, van Staa, T, Roberts, I, Shakur-Still, H, Smeeth, L