On April 25, 2019 WHO released new guidelines on:

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E6 Parks TextBook of Preventive & Social Medicine part 1 — Subpart C (pp 404-604 of 604) p. 30-32
E6 Ghai Essential Pediatrics(pp 26-904 of 913) p. 794-796
Practise the full BHU NO-2019
Attempt every question from this paper in a timed mock, then review the full solution for each one.