RT Journal T1 BIrth spacing and adverse perinatal outcomes—reply JF JAMA JO JAMA YR 2006 FD August 23 VO 296 IS 8 SP 929 OP 934 DO 10.1001/jama.296.8.929-b UL http://dx.doi.org/10.1001/jama.296.8.929-b AB