@article {9023, title = {The Benefits and Challenges of Collecting Physical Measures and Biomarkers in Cross-National Studies}, year = {2017}, month = {04/2017}, institution = {Survey Research Center, Institute for Social Research, University of Michigan}, address = {Ann Arbor, Michigan}, author = {Heidi M Guyer and Mary Beth Ofstedal and Lessof, Carli and Cox, Kate} }