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Padvetnaya, Vivek U ORCID: https://orcid.org/0000-0002-0955-3264, Liegise, Ruguoser ORCID: https://orcid.org/0009-0008-9645-2277, Sharma, Riddhi ORCID: https://orcid.org/0009-0004-0210-7239, Prabhu, Manohar Prasad, Nagabharana, TK, Suryanarayana, Kumar Gavali, Krishnaveni, Ghattu V, Matthews, Stephen G and Kumaran, Kalyanaraman (2026) Protocol for the economic evaluation of integrated longitudinal public health interventions in a cluster randomised controlled trial setting: the healthy life trajectories initiative. BMJ Open, 16 (6): e109918. ISSN 20446055