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Number of papers by objective of the research question (N=38)a.
| Research question type | Number of papers, n (%) |
| Creation or concept | 31 (82) |
| Forecasting or prediction | 7 (18) |
| Description | 6 (16) |
| Evaluation or criticism | 4 (11) |
| Explanation | 3 (8) |
aOne paper can include more than one category; therefore, the sum can be larger than 100%.
