An abstract is a single paragraph, without indentation, that summarizes the key points of the manuscript in 150 to 250 words. An abstract is a single paragraph, without indentation, that summarizes the key points of the manuscript in 200 to 250 words. An abstract is a single paragraph, without indentation, that summarizes the key points of the manuscript in 150 to 250 words. An abstract is a single paragraph, without indentation, that summarizes the key points of the manuscript in 200 to 250 words. An abstract is a single paragraph, without indentation, that summarizes the key points of the manuscript in 200 to 250 words. An abstract is a single paragraph, without indentation, that summarizes the key points of the manuscript in 200 to 250 words. An abstract is a single paragraph, without indentation, that summarizes the key points of the manuscript in 200 to 250 words. An abstract is a single paragraph, without indentation, that summarizes the key points of the manuscript in 200 to 250 words. An abstract is a single paragraph, without indentation, that summarizes the key points of the manuscript in 200 to 250 words.