A Point-of-Care Immunosensor for Human Chorionic Gonadotropin in Clinical Urine Samples Using a Cuneated Polysilicon Nanogap Lab-on-Chip. oleh S R Balakrishnan, U Hashim, Subash C B Gopinath, P Poopalan, H R Ramayya, M Iqbal Omar, R Haarindraprasad, P Veeradasan