作者:ICHNIOWSKI, C; FREEMAN, RB; LAUER, H
作者单位:National Bureau of Economic Research; Harvard University
作者:ADDISON, JT; PORTUGAL, P
作者单位:Otto Friedrich University Bamberg; Universidade do Porto
作者:BARTEL, AP
作者单位:National Bureau of Economic Research
作者:DUNNE, T; ROBERTS, MJ; SAMUELSON, L
作者单位:University of Pennsylvania
作者:BIDDLE, JE; ZARKIN, GA
作者单位:Research Triangle Institute
作者:KOSTIUK, PF; FOLLMANN, DA
作者单位:National Institutes of Health (NIH) - USA; NIH National Heart Lung & Blood Institute (NHLBI)