NEW YORK (Reuters) - Bon Jovi's Richie Sambora has dropped out of the current leg of the rock band's tour because of "personal issues," but the guitarist, who has done stints in rehab for problems with alcohol, tweeted fans on Wednesday that he was "well." "Thank you everyone for your concern," Sambora said on Twitter. "I'm well, but had to stay in LA to take care of a personal matter. Love you all and see you very soon. ...