The abstract should be structured into the subsections"BACKGROUND","OBJECTIVE","DESIGN,TIME AND SETTING","PARTICIPANTS/MATERIALS","I NTE RVENTIONS/METHODS","MAIN OUTCOME MEASURE(S)","RESULTS",and"CONCLUSION". BACKGROUND:A concise statement of the history and significance of the study OBJECTIVE:State the precise objective or study question addressed in the report(e.g.,"To determine whether...").If more than one objective is addressed,the main objective should be indicated and only key secondary objectives stated.If an a priori hypothesis was tested,it should be stated.
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