Integrating SARS-CoV-2 rapid antigen testing in maternal, neonatal and child health, HIV and tuberculosis services in Cameroon and Kenya: a cluster randomised trial of two testing models - Boris Tchounga; Nilesh Bhatt; James Ndimbii; Rhoderick Machekano; Anne-Cecile Zoung-Kanyi Bissek; Appolinaire Tiam; Stephen Siamba; Leonie Simo; Sharee Pearson; Aida Yemaneberhan; Laura Guay; Emilienne Epee; et al. (BMJ Public Health)