[1] Univ Copenhagen, Dept Publ Hlth, Copenhagen, Denmark
[2] Rajarata Univ Sri Lanka, Fac Med & Allied Sci, Dept Community Med, Saliyapura, Sri Lanka
[3] Univ Copenhagen, Dept Anthropol, Copenhagen, Denmark
[4] Rajarata Univ Sri Lanka, Fac Med & Allied Sci, Dept Med, Saliyapura, Sri Lanka