S. K. Sia, L. J. Kricka, Microfluidics and point-of-care testing, Lab Chip, vol. 8, pp. 1982–1983, 2008.
 C. D. Chin, V. Linder, S. K. Sia, Lab-on-a-chip devices for global health: Past studies and future opportunities, Lab Chip, vol. 7, pp. 41–57, 2007.
 P. Yager, T. Edwards, E. Fu, K. Helton, K. Nelson, M. R. Tam, B. H. Weigl, Microfluidic diagnostic technologies for global public health, Nature, vol. 442, pp. 412–418, 2006.
 W. Dungchaia, O. Chailapakul, C. S. Henry, Use of multiple colorimetric indicators for paper-based microfluidic devices, Anal. Chim. Acta, vol. 674 pp. 227–233, 2010.
 X. Mao, M. Baloda, A. S. Gurung, Y. Lin, G. Liu, Multiplex electrochemical immunoassay using gold nanoparticle probes and immunochromatographic strips, Electrochem. Commun., vol. 10, pp. 1636–640, 2008.
 A. W. Martinez, S. T. Phillips, E. Carrilho, S. W. Thomas, H. Sindi, G. M. Whitesides, Simple Telemedicine for Developing Regions: Camera Phones and Paper-Based Microfluidic Devices for Real-Time, Off-Site Diagnosis, Anal. Chem., vol. 80, pp. 3699–3707, 2008.
 A. W. Martinez, S. T. Phillips, M. J. Butte, G. M. Whitesides, Patterned Paper as a Platform for Inexpensive, Low-Volume, Portable Bioassays, Angew. Chem. Int. Ed., vol. 46, pp. 1318–1320, 2007.
 W. Dungchai, O. Chailapakul, C. S. Henry, Electrochemical detection for paper-based microfluidics, Anal Chem., vol. 81, pp. 5821–5826, 2009.
 X. Li, J. Tian, T. Nguyen, W. Shen, Paper-Based Microfluidic Devices by Plasma Treatment, Anal. Chem., vol. 80, pp. 9131–9134, 2008.
 One Step Drugs of Abuse Test, Core Technology Co., Ltd., Beijing, China, 2009.
 P. Fossati, L. Prencipe, G. Berti, Use of 3,5-dichloro-2-hydroxybenzenesulfonic acid/4-aminophenazone chromogenic system in direct enzymic assay of uric acid in serum and urine, Clin. Chem., vol. 26, pp. 227–231, 1980.
 P. R. Santagapita, M. P. Buera, Solid Lipid Nanoparticles as Delivery Systems for Bioactive Food Components, Food Biophys. vol. 3, pp. 87–93, 2008.
 L. Kreilgaard, S. Frokjaer, J. M. Flink, T. W. Randolph, J. F. Carpenter, Effects of additives on the stability of Humicola lanuginosa lipase during freeze-drying and storage in the dried solid, J. Pharm. Sci., vol. 88, pp. 281–290, 1999.