The Pfizer/BioNTech was available first so there is more data, but the Oxford/AstraZeneca was mostly used in the older age group. The study was not set up to look at any differences between the two. These results are very encouraging and have given us great reasons to be optimistic for the future, said Professor Aziz Sheikh, director of the University of Edinburghs Usher Institute. These results are very encouraging and have given us great reasons to be optimistic for the future, said Aziz Sheikh, a professor at the University of Edinburghs Usher Institute who co-led the study. These results are very encouraging and have given us great reasons to be optimistic for the future, said Aziz Sheikh, a professor at the University of Edinburghs Usher Institute who co-led the study.
The study was not done by a group.
( z0 study :ARG0 ( z1 group :polarity - ) )
(z0 / study-01
    :ARG0 (z1 / group
              :polarity -))
The study was not done by a group .
z1 :polarity 0
z0 :ARG0 z1