insulin_release(): beta-cell insulin release indices (HOMA-beta, CIR,
Stumvoll, Xinsdg30, Xinsg30, Di, Bigtt_air, Dibig) following
Madsen et al. (2024) doi:10.1038/s42255-024-01140-6.glucagon_release(): fasting glucagon and glucagon AUC.glucagon_resistance(): glucagon suppression ratio and fasting
glucagon:insulin ratio.