3024313 MCTS multicellular tumor spheroids 247 1292452 MTS multicellular tumor spheroids 128 2534952 MCTSs multicellular tumor spheroids 80 3089633 MTSs multicellular tumor spheroids 13 1226845 MCS multicellular tumor spheroids 5 3023340 MCSs multicellular tumor spheroids 3 3569073 MTS's multicellular tumor spheroids 1