Data collection systems for active safety surveillance of vaccines during pregnancy in low- and middle-income countries: developing and piloting an assessment tool (VPASS) by Maria Belizán, Federico Rodriguez Cairoli, Agustina Mazzoni, Erin Goucher, Sabra Zaraa, Sarah Matthews, Verónica Pingray, Andy Stergachis, Xu Xiong, Mabel Berrueta, Pierre Buekens

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