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Fig. 1 | BMC Public Health

Fig. 1

From: The effectiveness of pay-it-forward in addressing HPV vaccine delay and increasing uptake among 15–18-year-old adolescent girls compared to user-paid vaccination: a study protocol for a two-arm randomized controlled trial in China

Fig. 1

Pay-it-forward model overview. Pay-it-forward offers one individual an opportunity to receive subsidized HPV vaccination along with handwritten postcard messages, and a subsequent opportunity to voluntarily donate or create a postcard message to support more people

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BMC Public Health

ISSN: 1471-2458

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