Addressing challenges in using breath chemical analysis in smartphone-based health diagnostics. - Julia Vamvakari; George Pallis 002; Pawel Mochalski; Felipe Fernández; Ivo Ramos Maia Martins; Juan Mario Rodríguez; Milt Statheropoulos (EAI Endorsed Trans. Future Intell. Educ. Environ., 2016)