Inaccurate clinical nodal staging of non-small cell lung cancer: evidence from the MRC LU22 multicentre randomised trial. Issue 5 (30th April 2010) - Navani, N; Nankivell, M; Stephens, R J; Parmar, M K B; Gilligan, D; Nicolson, M; Groen, H J M; van Meerbeeck, J P