Screening for developmental delay at 18 months using the Infant Toddler Checklist: A validation study - Cornelia M. Borkhoff; Haris Imsirovic; Imaan Bayoumi; Colin Macarthur; Kimberly M. Nurse; Teresa To; Mark E. Feldman; Eddy Lau; Braden Knight; Catherine S. Birken; Jonathon L. Maguire; Patricia C. Parkin (PLoS ONE)