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     Item: 
      Title: Study protocol for monitoring SARS-­CoV-­2 infection and its determinants in Catalonia (Spain): an observational and participatory research approach in a Sentinel Network of Schools
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        Title: Abstract
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        Title: Introduction
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        Title: General objectives
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        Title: Methods and analysis
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          Title: Study design and setting
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          Title: Study population (inclusion criteria)
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          Title: Informed consent
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          Title: Study procedures
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           Item: 
            Title: KAB questionnaires regarding COVID-19 and impact of preventive and control measures
           Item: 
            Title: Prevalence of SARS-CoV-2 active infection and seroprevalence of antibodies against SARS-CoV-2
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            Title: Secondary attack rate and SARS-CoV-2 variants
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            Title: Environmental determinants and barriers
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            Title: Participatory research
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            Title: Sample management, microbiological analysis and test result communication
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          Title: Data management, data protection and patient confidentiality
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          Title: Study definitions
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          Title: Variables collected
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            Title: Individual data
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            Title: Collective data
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            Title: Ecological data
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          Title: Data analysis plan and sample size
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          Title: Patient and public involvement (PPI)
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        Title: Ethics and dissemination
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