function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['ENGEL, MICHAEL S. & GRIMALDI, DAVID A.', 1],
    ['Liu, Xingyue & Hayashi, Fumio & Yang, Ding', 5],
    ['Liu, Xingyue & Yang, Ding', 7],
    ['Martins, Caleb C. & Ardila-Camacho, Adrian', 1],
    ['Tu, Yuezheng & Zheng, Yuchen & Liu, Xingyue', 2],
    ['Wichard, Wilfried & Engel, Michael S.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=17)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 6, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);