Epidermal growth factor receptor (EGFR) mutation testing / study investigators and affiliations: Professor Mark McKeage (Pharmacology and Clinical Pharmacology and Auckland Cancer Research Centre, University of Auckland), Dr Donald Love (Diagnostic Genetics, LabPLUS, Auckland District Health Board), Mr Phillip Shepherd (Liggins Institute, University of Auckland), Professor Mark Elwood (Epidemiology and Biostatistics, University of Auckland), Dr George Laking (Medical Oncology, Auckland District Health Board), Dr Nichola Kingston (Pathology, LabPLUS, Auckland District Health Board), Dr Christopher Lewis (Respiratory Medicine, Auckland District Health Board).