Study flow. Study flow of different phases of data collection at the ED as well as GP-C from August 17 2007 until September 26 2009. In total 2206 ED and 768 GP-C encounters were registered. 1073 of the ED encounters were non walk-ins. All the patients consulting the GP-C were walk-ins. Out of the 1133 walk-ins at the ED a random sample of 257 (22.7%) encounters were coded according to ICPC. All of the 768 (100%) encounters in the GP-C were coded.