function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Du, Ping & Cao, Tian-Xu & Wu, Ying-Da & Zhou, Meng', 1],
    ['He, Shuang-Hui & Li, Hai-Jiao', 2],
    ['Karunarathna, Samantha C. & Priyashantha, K Hasith', 5],
    ['Nie, Ting & Tian, Yan & Liu, Shi-Liang & Yang, Jiao', 2],
    ['Wang, Xiang-Hua & Das, Kanad & Bera, Ishika & Chen, Yu-Hui', 1],
    ['Zambrano-Forero, Cristian J & Davila-Giraldo, Lina R', 1],
    ['Zhang, Xiaojie & Yuan, Qi & Su, Jiangqing & Zhao, Changlin', 4]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=16)',
    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);