Table 4. Data collection sources/instruments used in selected papers.

type of data collection	number of papers	citations
Animal collection	5	[28], [27], [29], [34], [36], [30]
Questionnaires/observations/surveys/etc	6	[26], [27], [29], [36], [30], [31]
Existing data on human death, hospitalization, or illness	6	[25]*, [12]*, [33]*, [35]*, [32]*, [31]*
Mapping/satellite/etc.	5	[25]*, [12]*, [33]*, [27]*, [32]*, [30]
Air quality sampling	1	[32]

Items in Table 4 with no asterisk are primary data. Items with an asterisk are secondary data.