[Application of cluster randomization method on typhoid Vi vaccine trails].
Dong BQ, Yang J, Tang ZZ, Yang HH, Zeng J, Zhang J, Wang ML, Liang GC, Si GA, Li CY, Liang DB, Liao HZ, Ochiai RL, Mohammad A, Acosta CJ, Clemens J.
Dong BQ, et al. Among authors: ochiai rl.
Zhonghua Liu Xing Bing Xue Za Zhi. 2005 Feb;26(2):97-100.
Zhonghua Liu Xing Bing Xue Za Zhi. 2005.
PMID: 15921608
Clinical Trial.
Chinese.