Table 1.

Headings of Structured Abstracts

Class	Example Heading Names
Aim	Goals, Objective, Purpose, Hypothesis, Introduction, Background, Context, Rationale
Intervention	Interventions, Interventions of the Study
Participants	Population, Patients, Subjects, Sample
Outcome Measures	Primary Outcome Parameters, Main Variables, Measures, Measurements, Assessments
Method	Materials, Study Design, Setting, Procedures, Process, Methodology, Research Design
Results	Results, Findings, Outcomes, Main Outcomes and Results
Conclusion	Conclusion, Conclusion and Clinical Relevance, Clinical Implications, Discussion, Interpretation

Examples of headings in structured abstracts that are mapped to equivalence classes for our classification purposes.