function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Canestrini, G.', 1],
    ['Haarder, Simon & Mąkol, Joanna', 3],
    ['LIU, DONG & YI, TIAN-CI & XU, YUN & ZHANG, ZHI-QIANG', 2],
    ['Ma, Min & Li, Sheng-Cai & Fan, Qing-Hai', 1],
    ['Saboori, Alireza & Irani-Nejad, Karim Haddad', 1],
    ['Saboori, Alireza & Shirvani, Zeinab', 2],
    ['Sevsay, Sevgi & Buğa, Evren & Elverici, Mert', 2],
    ['Stalstedt, Jeanette & Laydanowicz, Joanna & Lehtinen, Pekka T', 7],
    ['Willmann, C.', 2],
    ['Zhang, Zhi-Qiang & Saboori, Alireza', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=23)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 10, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);