Confounding Effect in Clinical Research of Otolaryngology and Its Control
Yong-qiang Yu, Dong-yan Huang, Susan Armijo Olivo, Huai-an Yang, Yagesh Bambanini, Lyn Sonnenberg, Brenda Clark, Gabriela Constantinescu, Jason Qian Yu, Ming Zhang
Chinese Medical Sciences Journal . 2015, (2): 121 -130 .  DOI: 10.1016/S1001-9294(15)30023-7

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