1 Subjects: “...survey...”

2 Subjects: “...student survey...”

3 Subjects: “...survey...”

4 Subjects: “...health impact survey...”

5 Subjects: “...drone survey...”

6 Subjects: “...drone survey...”

7 “..., difficulties remain regarding their legal classification. This work shall give a legal survey of the whole...”

8 “... cordially invite authors to contribute original articles, as well as survey articles, that give the readers...”