Smith MR, Singh GM, Mozaffarian D, Myers SS. Effects of decreases of animal pollinators on human nutrition and global health: a modelling analysis. Lancet. 2015 Nov 14;386(10007):1964-1972. doi: 10.1016/S0140-6736(15)61085-6. Epub 2015 Jul 15. PMID: 26188748.