1.
Ren W, Krenzke T, West B, Cantor D. An Evaluation of the quality of interviewer and virtual observations and their value for nonresponse bias reduction . SRM [Internet]. 2022 Apr. 10 [cited 2024 Apr. 18];16(1):97-131. Available from: https://ojs.ub.uni-konstanz.de/srm/article/view/7767