A character string or a vector of character containing the
names of the countries for which to return contact data
location
Character. One of "all", "home", "school", "work" or "other".
Value
A data.frame (in long format) with 4 columns:
country: the country name
age_from: the age group of individual
age_to: the age group of contact
contact: the intensity of contact
References
Kiesha Prem, Alex R. Cook, Mark Jit, Projecting social contact
matrices in 152 countries using contact surveys and demographic data, PLoS
Comp. Biol. (2017), 10.1371/journal.pcbi.1005697