function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Karunarathna, Samantha C. & Priyashantha, K Hasith', 2],
    ['Pu, Xue-Juan & Hu, Qian-Yi & Li, Su-Su & Li, Guo-Hong', 1],
    ['Tian, Yan & Ghobad-Nejhad, Masoomeh & He, Shuang-Hui', 3],
    ['Wu, Sheng-Hua & Wei, Chia-Ling & Lin, Yu-Ting', 4],
    ['Zambrano-Forero, Cristian J & Davila-Giraldo, Lina R', 3],
    ['Zhang, Xiaojie & Yuan, Qi & Su, Jiangqing & Zhao, Changlin', 7],
    ['de la Fuente, Javier Isaac & García-Jiménez, Jesús', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=21)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 7, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);