All measuring equipment in sites was uniform and was calibrated daily using standard weights for weight scale (the error less than 50 g) and the steel rule with a length of 2 m for Infantometer, Height-Sitheight Stadiometer. All investigators had participated in rigorous specialized training and passed an examination prior to the survey. Measurement errors were no more than 50 g in weight or 0.5 cm in length within intra-observer and inter-observer measurements.

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