In- and exclusion criteria for fine-tuning the dataset, inspired by [16].

aPreclinical Phase; bHuman clinical trials Phase One; cHuman clinical trials Phase Two; dHuman clinical trials Phase Three; eRegulatory submission to allow market entry; fProjects discontinued for any reason during any stage of the following stages of vaccine development in PC, PI, PII and PIII; gMarket phase; hPost-marketing, also known as human clinical trials phase four; iNo information available; jFailed or terminated vaccine products. In other words, products that have received regulatory market approval, but have been withdrawn from the market for any reason.