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Missing data occurred mainly within the same package of questionnaires, in total in 271 of the 1021 questionnaires.
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Postal questionnaires consist of the same package of instruments collected at baseline.
The patients filled in a package of questionnaires.
All other participants in 1999 only answered a smaller package of questionnaires including the PTDS.
A package of questionnaires was sent to the mothers' home addresses.
Overall, the GPs addressed 1311 patients, 1250 (95.3%) agreed to receive the package of questionnaires.
Patients who participate in this program complete a comprehensive package of questionnaires.
In total 1311 patients were addressed by the GPs, 1250 of them agreed to receive the package of questionnaires; 1021 (77.9%) packages were returned to the university.
The children provided saliva samples and filled out a package of questionnaires separately (as part of a larger study).
Additionally, a package of questionnaires was sent by mail to all patients 6 months after the last patient finished CBT.
The participants were then asked to complete a package of questionnaires in a room at the outpatient clinics.
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