zk-SNARK use cases in blockchain (except payment)?

zk-SNARK use cases in blockchain (except payment)?

Is there other examples of using zk-SNARK for supporting "private transactions" except Zerocoin or Zchach ? (For example, is it possible to use zk-SNARK for health data ? or any other use cases in which the data privacy is important ?)

The only example I found was related to the "payment use case" such as Zerocash . Does it mean zk-SNARK use case in blockchain is limited to use it only in the payment use case ?

Is there other research papers on using zk-SNARK for supporting data privacy and private (confidential) transactions in the blockchain except payment use case?

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