...: a global analysis of major non communicable diseases . Lancet London, England , 388 , 1311 1324 . doi: 10.1016 S0140 6736 16 30383 X Egger , M. , Davey Smith , G. , Schneider , M. , Minder , C . 1997 . Bias in meta analysis detected by a simple, graphical test...