PT - JOURNAL ARTICLE ED - , TI - Spending an additional 40 min outdoors each day reduces the incidence of myopia among primary school children in China AID - 10.1136/archdischild-2016-311102 DP - 2016 Aug 01 TA - Archives of disease in childhood - Education & practice edition PG - 219--219 VI - 101 IP - 4 4099 - http://ep.bmj.com/content/101/4/219.short 4100 - http://ep.bmj.com/content/101/4/219.full SO - Arch Dis Child Educ Pract Ed2016 Aug 01; 101