PubMed is the premier biomedical literature index that contains MEDLINE as well as other indexed literature in medicine, allied health, and related fields.
Sociological Abstracts is a database that focuses on population-based research, but contains numerous articles on ethics of care, community, health, and more.
PsycINFO is a psychology-focused database that contains useful information on other topics related to healthcare, therapy, treatment, theory, and more.