Impact of a child stimulation intervention on early child development in rural Peru: a cluster randomised trial using a reciprocal control design von Hartinger, Stella Maria, Lanata, Claudio Franco, Hattendorf, Jan, Wolf, Jennyfer, Gil, Ana Isabel, Obando, Mariela Ortiz, Noblega, Magaly, Verastegui, Hector, Mäusezahl, Daniel

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