3 ms·

One relevant study: http://www.ajmc.com/publications/supplement/2010/AJMC_10dec_HIT/AJMC_10decHIT_Jones_SP64to71 http://www.ajmc.com/publications/supplement/20

• absconditus 15y ago
  Another: http://archinte.ama-assn.org/cgi/content/short/170/17/1578 http://archinte.ama-assn.org/cgi/content/short/170/17/1578