作者单位:
Univ Connecticut, Dept Agr & Resource Econ, Coll Agr & Nat Resources, Storrs, CT USA
[1]
Texas A&M Univ, Dept Agr Econ, Coll Agr & Life Sci, College Stn, TX 77843 USA
[2]
Univ Washington, Dept Hlth Serv, Sch Publ Hlth, Coll Arts & Sci, Seattle, WA 98195 USA
[3]
发布时间
2015-07-17