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public function joinScreeningAction(Request $request)
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$translator = $this->get('translator');
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$params = $this->setupParameters($request, false);
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$params['page'] = array('title' => $translator->trans('Register for Participant Screening'));
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$previous = $request->request->get('registration');
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$prev_email = $previous ? (array_key_exists('email', $previous) ? $previous['email']['first'] : '') : '';
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$prev_browser = $previous ? (array_key_exists('browser', $previous) ? $previous['browser'] : array()) : array();