[1
]
Department of Nutrition and Food Hygiene, Qingdao University Medical College, Qingdao
266021, Shandong Province, China; Qingdao Municipal Center for Disease Control and
Prevention, Qingdao 266033, Shandong Province, China.
[2
]
Department of Nutrition and Food Hygiene, Qingdao University Medical College, Qingdao
266021, Shandong Province, China; Qingdao Municipal Center for Disease Control and
Prevention, Qingdao 266033, Shandong Province, China. Electronic address: 15726227711@163.com.
[3
]
Qingdao Municipal Center for Disease Control and Prevention, Qingdao 266033, Shandong
Province, China.
[4
]
Department of Public Health, University of Helsinki, Helsinki 00014, Finland.