1. Graduate Program in Mechanical Engineering, Pontificia Universidade Catolica do Paraná, Rua Imaculada Conceicao, 1150, Curitiba, PR 80250-901, Brazil (corresponding author).
2. Emeritus Professor, Dept. of Civil, Environmental, and Architectural Engineering, Univ. of Colorado Boulder, Boulder, CO 80309.
3. Postgraduate Program in Biomedical Engineering, Universidade Tecnologica Federal do Paraná, Rua Deputado Heitor Alencar Furtado, 5000, Curitiba, PR 81280-340, Brazil.