00421nas a2200145   4500000000100000008004100001100001500042700001500057700001600072700001700088245014200105300000700247490000700254022001400261       2012                            d1 aD. Simkiss1 aN. Spencer1 aN. Stallard1 aM. Thorogood00aHealth service use in families where children enter public care: a nested case control study using the General Practice Research Database  a650 v12  a1472-6963