Zhejiang Province according to socioeconomic status. In stage 2, 10 classes of middle school, 5 classes of academic high school and 5 classes of vocational high school were selected randomly within each chosen counties, respectively. In stage 3, all students in the chosen classes were invited to participate in the study. In China, after 6 years of primary school education, children usually attend middle school (ie, junior high school) for 3 years (grades 7--9). After graduation from middle schools, they enter high school (ie, senior high school, including academic high schools and vocational high schools) for a further 3 years (grades 10--12). The survey questionnaire was modelled from existing surveys including the Youth Risk Behaviour Survey, conducted by the Centers for Disease Control and Prevention (CDC),[@R26] and the international Global School-based StudentNews from around the world

MEXICO: Drug lord's wife has twins in Los Angeles County hospital

September 26, 2011 | 7:21
pm

This post has been updated. See the note at the bottom for details.

REPORTING FROM MEXICO CITY -- The spaces for “Name of Father” are blank. But the L.A. County birth certificates list the mother, who happens to be the young wife of one of history’s biggest and most sought-after drug lords, Joaquin “El Chapo” Guzman.

Emma Coronel traveled to Southern California in mid-July, and on Aug. 15 gave birth to twin girls at Antelope Valley Hospital in Lancaster, according to birth records and a senior U.S. law enforcement official.

Turns out Coronel, a 22-year-old former beauty queen, holds U.S. citizenship, which entitles her to travel freely to the U.S. and to use