pubmed:affiliation |
National Children's Center for Rural and Agricultural Health and Safety, Marshfield Medical Research and Education Foundation, Marshfield, Wisconsin 54449, USA. marlengb@mfldclin.edu
|
pubmed:publicationType |
Journal Article,
Clinical Trial,
Research Support, U.S. Gov't, P.H.S.,
Randomized Controlled Trial,
Research Support, Non-U.S. Gov't,
Multicenter Study
|