Table 1.

In-Depth Interview Guide

Opening	I am going to show you two questions. If you have any trouble reading the questions, we would be happy to read it to you. As you respond to the questions, please try to think out loud about your experience as you go. Please describe your thoughts, feelings and choices about the questions.
Required “think-aloud” probes	What are you thinking about as you answer this question? How do you feel about the wording of that question? Is it understandable? Do you think most people would understand it? Are there any words or phrases that could be misunderstood?
Optional “think-aloud” probes	How did you decide on your response choice? What does the question mean to you, in your own words? Is there anything else about this question that you'd like to tell me?
Discomfort other than pain	Going beyond these two questions, are there any kinds of discomfort, besides bodily pain, that are important to you? If yes: What are they? Did you have them in mind when answering the two questions I showed you?