Have parenting programs for disruptive child behavior become less effective?

Patty Leijten, G J Melendez-Torres, Sophia Backhaus, Frances Gardner, Annabeth P Groenman, Tycho J Dekkers, Barbara J van den Hoofdakker, Liina Björg Laas Sigurðardóttir, Danni Liu, Marjolein Luman, Lara Mansur, Merlin Nieterau, Saskia van der Oord, Geertjan Overbeek, Constantina Psyllou, Karen Rienks, Susanne Schulz, John R Weisz