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Full text from the Univ. of Michigan Library free resource MLibrary (Deep Blue) http://hdl.handle.net/2027.42/111165
Clinical Trials free resource MedlinePlus Health Information https://medlineplus.gov/clinicaltrials.html
free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/25228049/
free resource Europe PubMed Central https://europepmc.org/abstract/MED/25228049
subscription/membership/fee required Wiley https://onlinelibrary.wiley.com/doi/10.1111/biom.12228
free resource scite Smart Citations https://scite.ai/reports/25228049
subscription/membership/fee required Silverchair Information Systems https://academic.oup.com/biometrics/article-lookup/doi/10.1111/biom.12228