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The correct form is 'DIAGNOSED'.
both verb-ed and verb-ing are participle modifiers (the latter is a present participle the first is a past participle). A modifier can appear after another modifier in some cases. The reason VERB-ED is the correct form here is because passive form is required.

Here's the definition Google writes for "past participle":
"the form of a verb, typically ending in -ed in English, which is used in forming perfect and passive tenses and sometimes as an adjective, e.g. looked in have you looked?, lost in lost property."

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