Studies should, therefore, use a variety of databases, including not only emergency department records, but also general medical record reviews and insurance and Medicare/Medicaid claims to detect outpatient visits.
It is imperative to detail outpatient visits via a variety of records. 
mnli hypothesis: It is imperative to detail outpatient visits via a variety of records.  premise: Studies should, therefore, use a variety of databases, including not only emergency department records, but also general medical record reviews and insurance and Medicare/Medicaid claims to detect outpatient visits.