Similarities and differences in child development from birth to age 3 years by sex and across four countries: a cross-sectional, observational study by Ilgi Ozturk Ertem, ProfMD, Vibha Krishnamurthy, MD, Mphelekedzeni C Mulaudzi, MD, Yanina Sguassero, MD, Hakan Balta, MD, Ozlem Gulumser, MD, Burcu Bilik, MSc, Roopa Srinivasan, MD, Benjamin Johnson, MSc, Geliang Gan, PhD, Lisa Calvocoressi, PhD, Veronika Shabanova, PhD, Brian W C Forsyth, ProfMBChB

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