title: Rigorous evaluation. Greater need than ever.
mesh_terms: D000551:Ambroxol / Q000627:therapeutic use*; D001964:Bromhexine / Q000031:analogs & derivatives*; D002986:Clinical Trials as Topic; D005100:Expectorants / Q000627:therapeutic use*; D006801:Humans; D011897:Random Allocation
chemical_list: D005100:Expectorants; D000551:Ambroxol; D001964:Bromhexine