Symptoms and signs of lung cancer prior to diagnosis: case–control study using electronic health records from ambulatory care within a large US-based tertiary care centre by Richard D Neal, Fiona M Walter, Morhaf Al Achkar, Monica Zigman Suchsland, Grace Turner, Matthew J Thompson, Larry G Kessler, Farhood Farjah, Caroline A Thompson, Maria G Prado, Margaret A Au, Hannah A Burkhardt, Lesleigh Kowalski, Kari A Stephens, Meliha Yetisgen, Kevin Lybarger, Elizabeth A Sarma

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