Prot# RD.03.SPR.29074: Efficacy and Safety Comparison of Adapalene 0.1%/Benzoyl Peroxide 2.5% Gel Associated with Doxycycline Hyclate 100mg Tablets versus Adapalene 0.1%/Benzoyl Peroxide 2.5% Vehicle Gel Associated with Doxycycline Hyclate 100mg Tablets