{{Cite journal| doi = 10.1016/j.vaccine.2021.07.045| issn = 0264410X| pages = –0264410X21009233| last1 = Paul| first1 = Elisabeth| last2 = Brown| first2 = Garrett W.| last3 = Kalk| first3 = Andreas| last4 = Ridde| first4 = Valéry| title = Playing vaccine roulette: Why the current strategy of staking everything on Covid-19 vaccines is a high-stakes wager| journal = Vaccine| access-date = 2021-07-26| date = 2021-07| url = https://linkinghub.elsevier.com/retrieve/pii/S0264410X21009233}}