A. Voutilainen, J. K. Virtanen, S. Hantunen, T. Nurmi, P. Kokko, and T.-P. Tuomainen, “Nonoptimal Follow-up Times Make It Difficult to Detect the Epidemiological Inverse Relationship Between 25-Hydroxyvitamin D and Lung Cancer”, Biostatistics Research, vol. 1, no. 1, pp. 1–10, Sep. 2021.