In Fig 1, the term self-harm should be self-poisoning. In Fig 2 under the flowchart for cases, the number of patients admitted for self-poisoning should be 481 and the not eligible number should be 140. Please see the correct Figs 1 and 2 here.

Fig 1

Graphical presentation of the conceptual models used to inform statistical analysis.

Fig 2

Participant recruitment for cases, and hospital controls.