A randomized double blind placebo controlled clinical evaluation of extract of Andrographis paniculata (KalmCold (TM)) in patients with uncomplicated upper respiratory tract infection - Saxena, R C; Singh, R; Kumar, P; Yadav, S C; Negi, M PS; Saxena, V S; Joshua, A J; Vijayabalaji, V; Goudar, K S; Venkateshwarlu, K; Amit, A (Phytomedicine, 2010)