RT Journal Article SR Electronic T1 Air pollution and congenital anomalies JF Occupational and Environmental Medicine JO Occup Environ Med FD BMJ Publishing Group Ltd SP 221 OP 222 DO 10.1136/oem.2009.051201 VO 67 IS 4 A1 Beate Ritz YR 2010 UL http://oem.bmj.com/content/67/4/221.abstract AB