Study protocol: healthy urban living and ageing in place (HULAP): an international, mixed methods study examining the associations between physical activity, built and social environments for older adults the UK and Brazil

• Geraint EllisQueen's University Belfast
• Ruth Fiona HunterQueen's University Belfast
• Adriano Akira Ferreira HinoPontifícia Universidade Católica do Paraná
• Claire Cleland
• Sara Ferguson
• Brendan Murtagh
• Ciro Romélio Rodríguez-AñezUniversidade Tecnológica Federal do Paraná
• Sara MeloQueen's University Belfast
• Mark A. TullyQueen's University Belfast
• Frank KeeQueen's University Belfast
• Urmi Sengupta
• Rodrigo Siqueira ReisPontifícia Universidade Católica do Paraná