<style face="normal" font="default" size="100%">Development of a questionnaire for the assessment of sources of stress in Spanish soccer referees</style>

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0<style face="normal" font="default" size="100%">Development of a questionnaire for the assessment of sources of stress in Spanish soccer referees</style><style face="normal" font="default" size="100%">Development of a questionnaire for the assessment of sources of stress in Spanish soccer referees</style>