function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Evenhuis, Neal L.', 1],
    ['Evenhuis, Neal L. & Gharali, Babak', 11],
    ['Gharali, Babak & Kamali, Karim & Evenhuis, Neal', 7],
    ['Greathead, D. J. & Evenhuis, N. L.', 3],
    ['Greathead, David J. & Evenhuis, Neal L.', 1],
    ['Moghbeli, Sajjad & Fekrat, Lida & Gharali, Babak', 3],
    ['Yao, Gang & Chen, Gao', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=27)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 7, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);