1. Mehra, M. R., Ruschitzka, F. & Patel, A. N. Lancet 395, 1820 (2020).
2. Mehra, M. R., Desai, S. S., Kuy, S., Henry, T. D. & Patel, A. N. N. Eng. J. Med. 382, 2582 (2020).
3. Watson, J. et al. An open letter to Mehra et al. and The Lancet. Zenodo https://go.nature.com/3eRhiuo (2020).
4. A health data firm making extraordinary claims about its data. Free Range Statistics https://go.nature.com/2YPEhAz (2020).
5. Davey, M., Kirchgaessner, S. & Boseley, S. Surgisphere: governments and WHO changed Covid-19 policy based on suspect data from tiny US company. The Guardian https://go.nature.com/3dTu9uE (3 June 2020).