A controlled clinical trial will be performed. School children from the age of 10 to 11 will be selected to learn basic life support (BLS) in a primary school of Zaragoza. One of the groups will learn BLS in two consecutive years and the other group will learn BLS only the first year. The investigators think that the knowledge will be better in the group that receives two interventions.
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To evaluate the knowledge level of BLS after receiving one or two interventions
Timeframe: 3 hours
To compare test results obtained previous and after intervention.
Timeframe: 1 month