Implementing systematic screening and structured care for distressed callers using Cancer Council's telephone services: protocol for a randomized stepped-wedge trial

- Fradgley, Elizabeth A.; Boltong, Anna; Roach, Della; Taylor, Jo; Paul, Christine L.; O'Brien, Lorna; Boyes , Allison W.; Lane, Katherine; Beattie, Annette; Clinton-McHarg, Tara; Jacobsen, Paul B.; Doran, Christopher; Barker , Daniel