function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Foon, Junn Kitt & Clements, Gopalasamy Reuben & Liew, Thor-Seng', 1],
    ['Inkhavilay, Khamla & Sutcharit, Chirasak & Bantaowong, Ueangfa', 1],
    ['Jarvis, Charlie', 2],
    ['Lee, Jie Ying & Nasir, Nurul Syafiqah', 1],
    ['Marzuki, Mohammad Effendi bin & Liew, Thor-Seng', 4],
    ['Phung, Chee-Chean & Yu, Fred Tuh Yit & Liew, Thor-Seng', 2],
    ['Vermeulen, Jaap J. & Liew, Thor-Seng & Schilthuizen, Menno', 8],
    ['Zhou, Ya-Dong & Mwachala, Geoffrey & Hu, Guang-Wan', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=20)',
    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);