TY - Chinese Medical Sciences Journal A1 - 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 T1 - Confounding Effect in Clinical Research of Otolaryngology and Its Control Y1 - 2015-07-02 JF - Chinese Medical Sciences Journal JO - Chinese Medical Sciences Journal SP - 121 EP - 130 VL - 30 IS - 2 UR - http://cmsj.cams.cn N1 - 10.1016/S1001-9294(15)30023-7 ER -