function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Cilbircioğlu, Cihan & Çobanoğlu, Sultan', 4],
    ['Ebrahimi, Najmeh & Noei, Javad', 2],
    ['Fan, Qing-Hai & Zhang, Zhi-Qiang', 5],
    ['Flechtmann, Carlos H. W. & Etienne, Jean', 1],
    ['Khanjani, Farshad Masoudian Mohammad & Saboori, Alireza', 2],
    ['Ma, Min & Li, Sheng-Cai & Fan, Qing-Hai', 1],
    ['Masoudian, Farshad & Khanjani, Mohammad & Saboori, Alireza', 2],
    ['Willmann, C.', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=19)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 8, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);