00483nas a2200169   4500000000100000008004100001100001700042700001600059700001700075700001400092700001600106700001400122245014800136300000800284490000700292022001400299       2014                            d1 aM. Gulliford1 aT. van Staa1 aL. McDermott1 aG. McCann1 aJ. Charlton1 aA. Dregan00aCluster randomized trials utilizing primary care electronic health records: methodological issues in design, conduct, and analysis (eCRT Study)  a2200 v15  a1745-6215