function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Amarasinghe, A. A. Thasun & Campbell, Patrick D. & Riyanto, Awal', 1],
    ['Amarasinghe, A. A. Thasun & Ineich, Ivan & Riyanto, Awal', 1],
    ['Amarasinghe, A. A. Thasun & Kamsi, Mistar & Riyanto, Awal', 2],
    ['Chan, Kin Onn & Muin, Mohd Abdul & Anuar, Shahrul & Andam, Joel', 1],
    ['Chandramouli, S. R. & Adhikari, Omkar D.', 5],
    ['Fatihah-Syafiq, Muhamad & Badli-Sham, Baizul Hafsyam', 1],
    ['Figueroa, Alex & Low, Martyn E. Y. & Lim, Kelvin K. P.', 2],
    ['Grismer, L. Lee & Quah, Evan S. H.', 2],
    ['Grismer, L. Lee & Wood, P. L. & Lee, Cheol Haeng', 1],
    ['Hoser, Raymond', 1],
    ['Teynié, Alexandre & David, Patrick & Ohler, Annemarie', 1],
    ['Zijia, Hong & Anuar, Shahrul & Grismer, L. Lee', 1],
    ['Zug, George R. & Mulcahy, Daniel G. & Vindum, Jens V.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=20)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 13, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);