As the author said in this letter, we conducted a cross-sectional study, and causality
could not be determined. We mentioned this limitation in the discussion part.
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Article info
Publication history
Published online: September 05, 2013
Accepted:
August 6,
2013
Received:
August 5,
2013
Identification
Copyright
© 2013 Elsevier B.V. Published by Elsevier Inc. All rights reserved.
