function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Alfred W. Thomson & Lawrence M. Page', 7],
    ['Berg, L. S.', 2],
    ['Day, F.', 2],
    ['Hora, S. L.', 1],
    ['Lin, S. - Y.', 1],
    ['Mai, D. Y.', 2],
    ['McClelland, J.', 2],
    ['Popta, C. M. L.', 1],
    ['Rendahl, H. & Vestergren, G.', 1],
    ['Steindachner, F.', 3],
    ['Tchang, T. - L.', 1],
    ['Thoni, Ryan J. & Simonov, Evgeniy & Artaev, Oleg', 1],
    ['Vaillant, L. L.', 1],
    ['Çiçek, Erdoğan & Fricke, Ronald & Eagderi, Soheil', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=27)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 14, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);