00407nas a2200145 4500000000100000000000100001008004100002100001200043700001200055700001400067245014700081300001200228490000700240022001400247 2018 d1 aT. Chen1 aL. Chen1 aR. Knaggs00aA 15-year overview of increasing tramadol utilisation and associated mortality and the impact of tramadol classification in the United Kingdom a487-4940 v27 a1053-8569