The phrase "are only possible through" is correct and usable in written English.
It can be used to indicate that something can only occur as a result of a specific method or means.
Example: "These advancements in technology are only possible through collaborative efforts among researchers and developers."
Alternatives: "can only be achieved by" or "are achievable solely via".
GWA studies clearly need massive sample sizes that are only possible through genuine collaborations.
Such transactions are only possible through electronic commerce, but by setting just one price in a 24-hour period, P.G.& E.'s system is hardly taking full advantage.
Normally increases in power density are only possible through significant reductions in energy density, however emerging materials research is showing this needs not to be the case.
It's easy to see how these powerful business-building strategies are only possible through sharing richer customer and transaction data in real time.
They realize the studies are only possible through the generosity of people who consent to participate and that we have an obligation to ensure that their efforts contribute as much as possible to knowledge generation – and that is essential to gain the trust necessary to recruit future participants.
As we work to preserve the kind of innovative programs that are proven economic engines, we understand that they are only possible through responsible management.
Youth football is only possible through the support of parents.
Fostering innovation in healthcare technology is only possible through collaboration between forward-thinking academics and researchers.
In the past it is only possible through lengthy and burdensome cloning procedures.
For cattle the distinction between scavenging and predation was only possible through continuous monitoring.
But if happiness is only possible through the pursuit of new experiences, what role does memory have?
