Massive Infrared-Quiet Dense Cores: Unveiling the Initial Conditions of   High-Mass Star Formation
  As Pr. Th. Henning said at the conference, cold precursors of high-mass stars are now "hot topics". We here propose some observational criteria to identify massive infrared-quiet dense cores which can host the high-mass analogs of Class 0 protostars and pre-stellar condensations. We also show how far-infrared to millimeter imaging surveys of entire complexes forming OB stars are starting to unveil the initial conditions of high-mass star formation. 
Fr\'ed\'erique Motte (AIME), S. Bontemps (OASU, L3ab), N. Schneider   (AIME), P. Schilke (MPIFR), K. M. Menten (MPIFR)