It turns out that Oswin has erased memory of the Doctor from every single Dalek.

FORBES: Doctor Who 7.01: Season 7 Starts Off with a Bang (and a Bait and Switch)

East and North Hertfordshire NHS Trust has been found in breach of data protection after a doctor lost a memory stick on a train.

BBC: Patients' details lost on train by Hertfordshire doctor

If you're concerned about memory loss, see your doctor.

CNN: Memory loss: When to seek help

However, according to a report in Hospital Doctor magazine, there is no memory clinic in the area where the Martinez's live.

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In addition to a general physical exam, your doctor will likely conduct relatively brief question-and-answer tests to judge your memory and other thinking skills.

CNN: Memory loss: When to seek help