You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "Wade-Dahl-Till valve was partially built by the novelist of what nationality?" whose answer is British.
Each document should contain about 30 words, and these documents should contain useful information.

Query: Wade-Dahl-Till valve background and origin
Useful Output:

Doc 1: The Wade–Dahl–Till (WDT) valve was made of stainless steel, and patients were only charged the costs to produce the valve [2, 3].
Doc 2: The Wade-Dahl-Till valve, a cerebral shunt used to treat hydrocephalus, was developed by the famous author Roald Dahl along with hydraulic engineer Stanley
Doc 3: moved back to the United Kingdom in January 1961 [2]. Back in the UK, Theo suffered from hydrocephalus due to. multiple shunt obstructions with
Doc 4: The Wade-Dahl-Till (WDT) valve is a cerebral shunt developed in 1962 by hydraulic engineer Stanley Wade, author Roald Dahl.
Doc 5: Etymology. Developed in 1962 by hydraulic engineer Stanley Wade, author Roald Dahl, and neurosurgeon Kenneth Till.