In vivo readout of CFTR function: ratiometric measurement of CFTR-dependent secretion by individual, identifiable human sweat glands. oleh Jeffrey J Wine, Jessica E Char, Jonathan Chen, Hyung-Ju Cho, Colleen Dunn, Eric Frisbee, Nam Soo Joo, Carlos Milla, Sara E Modlin, Il-Ho Park, Ewart A C Thomas, Kim V Tran, Rohan Verma, Marlene H Wolfe