Comparative validity assessment of three android step counter applications; a semi-structured laboratory-based study. - Chukwuemeka, Uchechukwu Martha; Nnalue, Arinze Damian; Obiekwe, Sochima Johnmark; Maruf, Fatai Adesina; Anakor, Anthony Chinedu; Moses, Monday Omoniyi; Amaechi, Chinedum; Okonkwo, Uchenna Prosper; Amaechi, Ifeoma Adaigwe (BMC Digital Health, 2025)