The MAL-ED cohort study: methods and lessons learned when assessing early child development and caregiving mediators in infants and young children in 8 low- and middle-income countries. - Murray-Kolb LE; Rasmussen ZA; Scharf RJ; Rasheed MA; Svensen E; Seidman JC; Tofail F; Koshy B; Shrestha R; Maphula A; Vasquez AO; da Costa HP; et al. (Clinical infectious diseases : an official publication of the Infectious Diseases Society of America, 2014)