Approaches to implementing and financing primary health care in Kenya: a case of seven counties - Karimi, Janette; Hussien, Salim; Wangia, Elizabeth; Kimani, Mercy-Irene; Mohamed, Mohamud; Wanda, Melissa; Muganda, Rosemarie; Ndirangu, Rachel; Mwai, Daniel; Wanjala, Mercy; Richter, Fadhila (Frontiers in Health Services, 2025)