Pay-It-Forward 23-Valent Pneumococcal Polysaccharide Vaccination Among Older Adults: Protocol for a Randomized Controlled Trial

Jiao Qin   ^{1 *} , MPH ;   Liangjia Wei   ^{1 *} , PhD ;   Chunxing Tao   ^{1 *} , MPH ;   Jinfeng He   ¹ , MPH ;   Dan Wu   ² , PhD ;   Zhifeng Lin   ¹ , MPH ;   Ting Huang   ¹ , MPH ;   Shiyu Qin   ¹ , MPH ;   Qiuqian Su   ¹ , MPH ;   Yanxiao Gao   ³ , PhD ;   Shuiming Chen   ⁴ , BSc ;   Ganqin Wang   ⁵ , BSc ;   Xianyan Tang   ¹ , PhD ;   Li Ye   ¹ , PhD ;   Hao Liang   ¹ , PhD ;   Chuanyi Ning   ¹ , PhD ;   Weiming Tang   ^{6, 7} , PhD ;   Joseph D Tucker   ^{8, 9} , PhD ;   Bingyu Liang   ^{1, 8} , PhD

¹ Guangxi Key Laboratory of AIDS Prevention and Treatment, School of Public Health & Life Science Institute, Guangxi Medical University, Nanning, China

² Department of Social Medicine and Health Education, School of Public Health, Nanjing Medical University, Nanjing, China

³ Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China

⁴ Jinzhou Community Health Center, Nanning, China

⁵ West of Panlong Community Health Center, The Second People's Hospital of Nanning, Nanning, China

⁶ Dermatology Hospital of Southern Medical University, Guangzhou, China

⁷ University of North Carolina at Chapel Hill, Project-China, Guangzhou, China

⁸ London School of Hygiene and Tropical Medicine, Clinical Research Department, London, United Kingdom

⁹ Department of Medicine, University of North Carolina at Chapel-Hill, Chapel Hill, NC, United States

*these authors contributed equally