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 Academic Search Complete       
227
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205
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423
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317
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 JAMA Network       
359
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 BMJ Journal Online        
302
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 Directory of Open Access Journals (DOAJ)       
158
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 DOAJ : Directory of Open Access Journals       
154
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 Free Medical Journals.com        
244
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 HighWire Press        
200
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 Hindawi Publishing Corporation (Open Access Journal)       
203
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 J-STAGE        
201
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 JSTOR        
247
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 Karger Online Journal        
251
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 Mary Ann Liebert        
172
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 Nature Publishing Group       
250
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 OVID       
397
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244
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743
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522
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 ProQuest Nursing & Allied Health Source       
5