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John W. Oller, Christopher A. Shaw, Lucija Tomljenovic, Stephen K. Karanja, Wahome Ngare, Felicia M. Clement, Jamie Ryan Pillette: HCG Found in WHO Tetanus Vaccine in Kenya Raises Concern in the Developing World. In: Open Access Library Journal. 4. Jahrgang, Nr.10, Oktober 2017 (scirp.org).