Nineteen South Koreans held hostage for six weeks in Afghanistan are kept on the move by their Taliban captors but are in good health, a doctor in touch with a senior Taliban commander said Friday. Earlier this month, Dr. Mohammad Hashim Wahaaj delivered medicine to the Taliban to give to the South Koreans. He said he was not allowed to examine the hostages, but discussed any medical concerns over the phone with their captors. Wahaaj told a media conference he remained in regular telephone contact with Mullah Mansor, the Taliban commander in the area where the South Korean aid workers were kidnapped on July 19. He said the South Koreans "were fine and have no medical problems," but were split into several groups and were moved around every "six to eight hours" to keep one step ahead of Afghan security forces.