Jonathan A C Sterne, Alex J Sutton, John P A Ioannidis, Norma Terrin, David R Jones, Joseph Lau et al
Sterne J A C, Sutton A J, Ioannidis J P A, Terrin N, Jones D R, Lau J et al.
Recommendations for examining and interpreting funnel plot asymmetry in meta-analyses of randomised controlled trials
BMJ 2011; 343 :d4002
doi:10.1136/bmj.d4002