function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Jiang, Ning & Tian, Cheng-Ming', 1],
    ['Pintos, Angel & Alvarado, Pablo & Planas, Juan & Jarling, Rene', 11],
    ['Tang, Xia & Goonasekara, Ishani D. & Jayawardena, Ruvishika S.', 1],
    ['Wang, Mei & Tan, Xiao-Ming & Liu, Fang & Cai, Lei', 8]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=21)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 4, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);