RT Journal Article SR Electronic T1 Expression of concern: car safety seats for children: rear facing for best protection JF Injury Prevention JO Inj Prev FD BMJ Publishing Group Ltd SP e1 OP e1 DO 10.1136/ip.2006.015115eoc1 VO 23 IS 4 YR 2017 UL http://injuryprevention.bmj.com/content/23/4/e1.abstract AB