Prado MG, Kessler LG, Au MA, Burkhardt HA, Zigman Suchsland M, Kowalski L, Stephens KA, Yetisgen M, Walter FM, Neal RD, Lybarger K, Thompson CA, Al Achkar M, Sarma EA, Turner G, Farjah F, Thompson MJ. 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. BMJ Open. 2023 04 20; 13(4):e068832.