Figure 3From: The challenges of long-term follow-up data collection in non-commercial, academically-led breast cancer clinical trials: the UK perspective Information available on hospital electronic patient record systems. Data were obtained from returned questionnaires (see Additional file 1: Figure A1). ICD10, International Classification of Diseases-10; OPCS4, Operating Procedure Codes-4; SNOMED CT, Systematized Nomenclature of Medicine Clinical Terms.Back to article page