Source: https://www.researchgate.net/profile/Massimo-Ralli-2/publication/331688363_A_controlled_randomized_clinical_study_to_verify_the_efficacy_and_safety_of_a_new_hypertonic_solution_Narlisim_in_nasal_congestion_in_adults_affected_by_common_cold/links/5d5275a492851cd046b6dc74/A-controlled-randomized-clinical-study-to-verify-the-efficacy-and-safety-of-a-new-hypertonic-solution-Narlisim-in-nasal-congestion-in-adults-affected-by-common-cold.pdf