Hannigan, Caoimhe, Hanly, Paul, Kee, Frank, Lawlor, Brian, Holton, Eimile, Walsh, Cathal, Scharf, Thomas, Coen, Robert, Leatham, Vicky, Moynihan, Sean, Lane, Keith and Power, Joanna McHugh (2022) HALO: Study protocol for a single-case experimental design study evaluating the moderating impact of a befriending intervention on the association between loneliness and health in older adults. HRB Open Research, 3 (60). ISSN 2515-4826