Name Info Provider Link
free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/8268149/
free resource Europe PubMed Central https://europepmc.org/abstract/MED/8268149
free resource M2PI http://kjim.org/journal/view.html?year=1993&volume=8&number=1&spage=8