There are thousands of such lines that have been researched and documented. Bulk synthesis of polyaniline nanofibers, which has been researched extensively. Browne had researched the period and the event extensively. The concept had been previously researched by many authors. Los Angeles was extensively researched for the game. The role of autophagy in cancer is one that has been highly researched and reviewed. Transcendental Meditation has become one of the most widely researched meditation techniques. The causes of failure have been widely researched and can vary considerably. The numbers are still being researched and debated. Arab hammams in general are not widely researched among Western scholars. Lifeson recalled that Peart had "thoroughly" researched on the topic beforehand. Most of the contexting categories simply have not been researched enough to make firm conclusions. These events have been researched since the 1920s. Carl von Sickingen researched platinum extensively in 1772. This technique has been clinically researched since the mid-2000s.