aInternational Medical Center, Chinese PLA General Hospital bDepartment of Nutrition and Food Hygiene, School of Public Health, Peking University Health Science Center cInstitute of Aviation Medicine, Chinese PLA Air Force, Beijing, China Correspondence to Qiang Zeng, MD, PhD, International Medical Center, Chinese PLA General Hospital, 100853 Beijing, China Tel/fax: +86 10 68295751; e-mail: [email protected]*Qiang Zeng and Yuan He contributed equally to the writing of this article. Received July 15, 2012 Accepted July 17, 2012
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Zeng et al. (2012) studied this question.