Text and Data Mining valid from 2019-02-11
Received: 5 September 2018
Accepted: 18 January 2019
First Online: 11 February 2019
Compliance with ethical standards
: KL Shek and HP Dietz have received unrestricted educational grants from GE Medical. All other authors have no conflict of interest to declare.
: The parent trial was approved by the Sydney West and Sydney South Area Health Service Human Research Ethics Committees (SWAHS HREC 07–022 and SSAHS HREC X09–0384) on 30 April 2007.