The first author carried out a substantial portion of the work for this publication including: designing research instruments (70%), data collection (about 50%), analysis (100%), and writing of the paper (80%). The second author carried a proportion of the writing (20%), and directed the research project on which the paper is based. The third author (project senior researcher) was involved in the overall research design (80%) for the project from which the material in the paper is drawn; instrument design (30%) and data collection (50%). The fourth author was also involved in the direction of the project (with Caroline Gipps)