//xueshu.baidu.com/s?wd=paperuri%3A%28ccb87175e34f6bd1e5ca4922f5fba57f%29&filter=sc_long_sign&tn=SE_xueshusource_2kduw22v&sc_vurl=http%3A%2F%2Flink.springer.com%2Fcontent%2Fpdf%2F10.1186%252Fs13063-016-1481-3.pdf&ie=utf-8&sc_us=12657319155891887701
Springer
全网免费
http://www.socolar.com/Article/Index?aid=200181557941&jid=200000025603
socolar.com
全网免费
http://core.ac.uk/download/pdf/81608351.pdf
core.ac.uk
全网免费
http://www.xueshufan.com/publication/2491887287
xueshufan.com
全网免费
http://rd.springer.com/content/pdf/10.1186%2Fs13063-016-1481-3.pdf
Springer
全网免费
532.2K
http://trialsjournal.biomedcentral.com/track/pdf/10.1186/s13063-016-1481-3
BioMed Central
全网免费
http://pdfs.semanticscholar.org/f24c/d1cf94a0ed09fe924cecc0d4402129e8cfa3.pdf
pdfs.semanticscholar.org
全网免费
http://www.onacademic.com/detail/journal_1000039803065510_0c5a.html
onacademic.com
全网免费
http://www.trialsjournal.com/content/pdf/s13063-016-1481-3.pdf
trialsjournal.com
全网免费