RT Journal
A1 Brain JD, Kavet R, Valberg PA
T1 OBservations on power-line magnetic fields associated with asthma in children
JF Archives of Pediatrics & Adolescent Medicine
JO Archives of Pediatrics & Adolescent Medicine
YR 2012
FD January 1
VO 166
IS 1
SP 97
OP 99
DO 10.1001/archpedi.166.1.97-b
UL http://dx.doi.org/10.1001/archpedi.166.1.97-b
AB 
Li et al1 report an association between childhood asthma and maternal magnetic field exposure of 2 mG or more during pregnancy, based on a single day of personal magnetic field (40-800 Hz) measurement. While we have a common interest in understanding the causes and prevention of asthma, we offer the following concerns.