## materials
> * surveys (.doc and .qsf) and images used in all studies
> * can use .qsf to import survey into Qualtrics ([Importing a Survey](https://www.qualtrics.com/support/survey-platform/survey-module/survey-tools/import-and-export-surveys/#ImportingASurvey))
> * sound stimuli used in all studies (these are also embedded in .qsf files for each survey)
> * **stimuli.name**
> * name of stimuli
> * **sound.origin**
> * non-infectious, infectious
> * **sound.type**
> * cough, sneeze, sniff
> * **maturity**
> * adult or infant sound
> * **study1**
> * included in study 1 = 1
> * **study2.3**
> * included in study 2 or 3 = 1
> * **creation.date**
> * date we created the sound clip from YouTube
> * **cause.description**
> * describe how we determined origin
> * **youtube.title**
> * title of YouTube video
> * **url1.webarchive**
> * archived URL
> * **url1.original**
> * original URL
> * **url2.webarchive**
> * archived URL
> * **url2.original**
> * original URL
