Harrell et al, Mar 2007, Exclusion of pH Artifacts is Essential for Hypopharyngeal pH Monitoring.
Reference
Harrell, S. P.,
Koopman, J.,
Woosley, S.,
&
Wo, J. M.
Exclusion of pH Artifacts is Essential for Hypopharyngeal pH Monitoring.. The Laryngoscope, 117(3): 470-474. (2007).

