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Full text from the Univ. of Michigan Library free resource MLibrary (Deep Blue) http://hdl.handle.net/2027.42/153734
subscription/membership/fee required Ovid Technologies, Inc. http://ovidsp.ovid.com/ovidweb.cgi?T=JS&PAGE=linkout&SEARCH=31006913.ui
free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/31006913/
free resource Europe PubMed Central https://europepmc.org/abstract/MED/31006913
free resource Wiley https://onlinelibrary.wiley.com/doi/10.1002/uog.20299