The phrase "addition to the questionnaires" is correct and usable in written English.
It can be used when referring to something that is being included or added alongside the questionnaires.
Example: "In addition to the questionnaires, we will also conduct interviews to gather more detailed information."
Alternatives: "supplement to the questionnaires" or "complement to the questionnaires".
In addition to the questionnaires mentioned in Table 2, additional questions about asthma and rhinoconjunctivitis are included [ 31].
In addition to the questionnaires and Internet Skills scale from Study 1, participants also completed working memory tests, and reading comprehension tasks online.
In addition to the questionnaires, the dates for clinic appointments and number of prescribed ART doses were collected from individual patient records at the clinic.
In addition to the questionnaires, all study subjects are asked to provide a blood or saliva specimen for DNA analyses.
In addition to the questionnaires and calendars, the e-health intervention used by the intervention group will measure the use of the intervention, complications and (satisfaction with) recovery.
In addition to the questionnaires and anthropometric measurements, the study subjects were requested to return to the clinics to provide fasting blood samples for blood glucose and cholesterol measurements in the following morning.
In addition to the questionnaire completed by the patients, the treating neurologist filled in a questionnaire covering the clinical headache diagnosis and ever-before intake of five classes of standard prophylactic medication (betablocker, flunarizine, valproate, topiramate, amitriptyline).
In addition to the questionnaire, an informal survey in the form of focus group discussion and key informants' interview was employed using checklists to obtain additional supporting information for the study.
In addition to the questionnaire design, a reminder could be included at the beginning of each ACASI session, reminding participants that they are not obliged to answer any question that they find upsetting or inappropriate and may withdrawal from the research at anytime without giving a reason [33].
